0001680062-24-000016 | 10-Q | XBRL Viewer

DESCRIPTION OF BUSINESS (Tables)

6 Months Ended

Jun. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Direct or Indirect Interests of Subsidiaries

The Company has direct or indirect interests in the following subsidiaries:


			Effective interest held as at
Name of subsidiaries	Place and date of incorporation	Principal Activities	June 30, 2024		December 31, 2023
ACM Research (Shanghai), Inc. ("ACM Shanghai")	Mainland China, May 2005	Principal operating subsidiary	82.0	%	82.1	%
ACM Research (Wuxi), Inc. ("ACM Wuxi")	Mainland China, July 2011	Sales and services	82.0	%	82.1	%
CleanChip Technologies Limited ("CleanChip")	Hong Kong, June 2017	Trading partner between ACM Shanghai and its customers	82.0	%	82.1	%
ACM Research Korea CO., LTD.	Korea, December 2017	Sales, marketing, R&D, production	82.0	%	82.1	%
ACM Research ( Lingang), Inc. ("ACM Lingang") (1)	Mainland China, March 2019	Management of production activities	82.0	%	82.1	%
ACM Research (CA), Inc. ("ACM California")	USA, April 2019	Procurement for ACM Shanghai	82.0	%	82.1	%
ACM Research (Cayman), Inc.	Cayman Islands, April 2019	Administrative function (inactive)	100.0	%	100.0	%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")	Singapore, August 2021	Sales, marketing, business development	100.0	%	100.0	%
ACM Research (Beijing), Inc. ("ACM Beijing")	Mainland China, February 2022	Sales, marketing, business development	82.0	%	82.1	%
Hanguk ACM CO., LTD	Korea, March 2022	Sales, services, business development	100.0	%	100.0	%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, June 2023	Business development	82.0	%	82.1	%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	59.3	%	59.4	%

(1) ACM Research (Lingang) Inc. is the English name referred to by its Chinese language name Shengwei Research (Shanghai), Inc., or ACM Shengwei in prior filings. ACM Research (Lingang), Inc. and Shengwei Research (Shanghai), Inc. refer to the same entity.

LONG-TERM BORROWINGS

6 Months Ended

Jun. 30, 2024

Long-Term Debt, by Current and Noncurrent [Abstract]

LONG-TERM BORROWINGS

At June 30, 2024 and December 31, 2023, long-term borrowings consisted of the following:


	June 30, 2024		December 31, 2023
Loan from China Merchants Bank	$	12,441	$	13,362
Loans from Bank of China	17,370		5,013
Loan from Bank of Shanghai	14,040		14,120
Loans from China CITIC Bank	28,043		28,240
Loan from China Everbright Bank	18,610		—
Less: Current portion	(19,671)		(6,783)
Total	$	70,833	$	53,952

The loan from China Merchants Bank is for the purpose of purchasing housing property in Lingang, Shanghai. The loan is repayable in 120 total installments with the last installment due in November 2030, with an annual interest rate of 3.95%. The loan is pledged by the property of ACM Lingang and guaranteed by ACM Shanghai.

Two loans from Bank of China are for the purpose of funding ACM Shanghai project expenditures. The first loans bears interest at an annual rate of 2.6% and are repayable in 6 installments, with the last installments due in September 2024.

The second loan from Bank of China is for the purpose of funding ACM Shanghai's general corporate expenses and working capital. The loan bears interest at an annual rate of 2.62% and is payable in 6 installments, with the last installment due in June 2027.

The loan from Bank of Shanghai is for the purpose of funding ACM Shanghai project expenditures. The loan bears interest at an annual rate of 2.85%, and will be fully repaid in April 2025.

The first loan from China CITIC Bank is for the purpose of funding ACM Shanghai project expenditures. The loan bears interest at an annual rate of 3.1% and is repayable in 4 installments, with the last installment due in August 2025.

The second loan from China CITIC bank is for the purpose of funding ACM's general corporate expenses and working

capital. The loan bears interest at an annual rate of 4.50% payable quarterly, and the principal amount is repayable in 4

installments, with the last installment due in December 2025.

The loan from the China Everbright Bank is for the purpose of funding ACM's general corporate expenses and working

capital. The loan bears interest at an annual floating rate of 2.60% and is payable in 6 installments, with the last installment due in June 2027.

In April 2024, ACM entered into a loan facility with the Agricultural Bank of China for the purpose of funding ACM's general corporate expenses and working capital. As of June 30, 2024, ACM has not made any borrowings from the loan facility.

As of June 30, 2024 and December 31, 2023, the total carrying amount of long-term loans was $90,504 and $60,735, compared with an estimated fair value of $84,672 and $56,462, respectively. The fair value of the long-term loans is estimated by discounting cash flows using interest rates currently available for debts with similar terms and maturities (Level 2 fair value measurement). Refer to Note 2 for an explanation of the fair value hierarchy structure.

Scheduled principal payments for the outstanding long-term loan, including the current portion, as of June 30, 2024 are as follows:


Year ending December 31
remainder of 2024	$	4,690
2025	$	43,952
2026	1,989
2027	33,829
2028	1,994
Thereafter	4,050
	$	90,504

For the three months ended June 30, 2024 and 2023, respectively, interest related to long-term borrowings of $507 and $181 was incurred and all of them were charged to interest expenses.

For the six months ended June 30, 2024 and 2023, respectively, interest related to long-term borrowings of $1,077 and $370 was incurred, and all of them were charged to interest expenses

OTHER LONG-TERM LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2024

Other Liabilities Disclosure [Abstract]

Other Long-Term Liabilities

At June 30, 2024 and December 31, 2023, other long-term liabilities consisted of the following unearned government subsidies:


	June 30, 2024		December 31, 2023
Subsidies commenced in 2020 and prior	$	769	$	1,107
Subsidies to SW Lingang R&D development commenced in 2021	3,433		3,467
Other	1,303		1,299
Total	$	5,505	$	5,873

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Principles of Consolidation

The Company’s condensed consolidated financial statements include the accounts of ACM and its subsidiaries. ACM’s subsidiaries are those entities in which ACM, directly or indirectly, controls a majority of the voting power. All significant intercompany transactions and balances have been eliminated upon consolidation.

The accompanying condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting on Form 10-Q. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the historical consolidated financial statements of the Company for the year ended December 31, 2023 included in ACM’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023.

The accompanying condensed consolidated financial statements are unaudited. In the opinion of management, these unaudited condensed consolidated financial statements of the Company reflect all adjustments that are necessary for a fair presentation of the Company’s financial position and results of operations. Such adjustments are of a normal recurring nature, unless otherwise noted. The balance sheet as of June 30, 2024 and the results of operations for the three and six months ended June 30, 2024 are not necessarily indicative of the results to be expected for any future period.

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the balance sheet date and the reported revenues and expenses during the reported period in the condensed consolidated financial statements and accompanying notes. The Company’s significant accounting estimates and assumptions include, but are not limited to, those used for revenue recognition and deferred revenue, the valuation and recognition of fair value of certain short-term investments and long-term investments, stock-based compensation arrangements, realization of deferred tax assets, assessment for impairment of long-lived assets and long-term investments, allowance for credit losses, inventory valuation, useful lives of property, plant and equipment and useful lives of intangible assets.

Management evaluates these estimates and assumptions on a regular basis. Actual results could differ from those estimates and assumptions.

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand, bank deposits that are unrestricted as to withdrawal and use, and highly liquid investments with an original maturity date of three months or less at the date of purchase. At times, cash deposits may exceed government-insured limits.

The following table presents cash and cash equivalents, according to jurisdiction as of June 30, 2024 and December 31, 2023:


	June 30, 2024		December 31, 2023
United States	$	40,515	$	43,614
Mainland China	87,733		70,418
China Hong Kong	194,979		64,057
Korea	737		3,934
Singapore	67		67
Total	$	324,031	$	182,090

The amounts in mainland China do not include short-term and long-term time deposits which totaled $41,839 and $121,342 at June 30, 2024 and December 31, 2023, respectively.

Cash held in the U.S. exceeds the Federal Deposit Insurance Corporation insurance limits and is subject to risk of loss. No losses have been experienced to date.

Cash amounts held in mainland China are subject to a series of risk control regulatory standards from mainland China bank regulatory authorities. ACM’s subsidiaries in mainland China are required to obtain approval from the State Administration of Foreign Exchange (“SAFE”) to transfer funds into or out of mainland China. SAFE requires a valid agreement to approve the transfers, which are processed through a bank. Other than these mainland China foreign exchange restrictions, ACM’s subsidiaries in mainland China are not subject to any restrictions and limitations on its ability to transfer funds to ACM or among our other subsidiaries. However, cash held in mainland China does exceed applicable insurance limits and is subject to risk of loss, although no such losses have been experienced to date.

ACM California periodically procures goods and services on behalf of ACM Shanghai and ACM Lingang. For these transactions, ACM Shanghai and ACM Lingang make cash payments to ACM California in accordance with applicable transfer pricing arrangements. For the three months ended June 30, 2024 and 2023, cash payments from ACM Shanghai and ACM Lingang to ACM California for the procurement of goods and services was $9,751 and $14,500, respectively. For the six months ended June 30, 2024 and 2023, cash payments from ACM Shanghai and ACM Lingang to ACM California for the procurement of goods and services was $14,399 and $25,431, respectively. ACM California periodically borrows funds for working capital advances from its direct parent, CleanChip. ACM California repays or renews these intercompany loans in accordance with their terms.

For sales through CleanChip and ACM Research, a certain amount of sales or advanced payments from customers is repatriated back to ACM Shanghai in accordance with applicable transfer pricing arrangements in the ordinary course of business. ACM Research provides services to certain customers located in the U.S., Europe and other regions outside of mainland China to support the evaluation of first tools and provide support for tools under warranty on behalf of ACM Shanghai. For these transactions, ACM Shanghai makes cash payments to ACM Research in accordance with applicable transfer pricing arrangements.

Amounts held in Korea exceed the Korea Deposit Insurance Corporation insurance limits and is subject to risk of loss. No losses have been experienced to date. There is no additional restriction for the transfer of cash from bank accounts in the U.S., Korea, Singapore and Hong Kong.

For the six months ended June 30, 2024 and 2023, with the exception of sales and services-related transfer-pricing payments in the ordinary course of business, no transfers, or distributions have been made between ACM Research and its subsidiaries, including ACM Shanghai, or to holders of ACM Research Class A common stock.

Time Deposits

Time deposits are deposited with banks in mainland China with fixed terms and interest rates which cannot be withdrawn before maturity, and are presented as short-term deposits and long-term deposits in the condensed consolidated financial statements based on their expected time of collection. They are also subject to the risk control regulatory standards described above upon maturity.

At June 30, 2024 and December 31, 2023, time deposits consisted of the following:


	June 30, 2024		December 31, 2023
Deposit in China Merchant Bank which matured on January 29, 2024 with an annual interest rate of 2.85%	$	—	$	29,797
Deposit in Bank of Ningbo which matured on February 17, 2024 with an annual interest rate of 2.85%	$	—	$	44,630
Deposit in Shanghai Pudong Development Bank which was redeemed on June 20, 2024 with an annual interest rate of 3.10%	$	—	$	7,322
Deposit in Shanghai Pudong Development Bank which was redeemed on May 28, 2024 with an annual interest rate of 3.10%	$	—	$	7,307
Deposit in Shanghai Pudong Development Bank which was redeemed on March 7, 2024 with an annual interest rate of 3.10%	$	—	$	4,376
Deposit in Shanghai Pudong Development Bank which was redeemed on March 22, 2024 with an annual interest rate of 3.10%	$	—	$	4,373
Deposit in Shanghai Pudong Development Bank which was redeemed on January 29, 2024 with an annual interest rate of 3.10%	$	—	$	2,912
Deposit in China Industrial Bank which matures on January 30, 2026 with an annual interest rate of 3.15%	$	14,656	$	14,528
Deposit in China Everbright Bank which matured on January 5, 2024 with an annual interest rate of 5.38%	$	—	$	3,079
Deposit in China Everbright Bank which matured on May 22, 2024 with an annual interest rate of 5.28%	$	—	$	3,018
Deposit in China Everbright Bank which matures on July 8, 2024 with an annual interest rate of 5.29%	$	3,036	$	—
Deposit in China Everbright Bank which matures on November 23, 2024 with an annual interest rate of 5.28%	$	10,055	$	—
Deposit in Bank of Ningbo which matures on September 11, 2024 with an annual interest rate of 1.50%	$	14,092	$	—
	$	41,839	$	121,342

For the three months ended June 30, 2024 and 2023, interest income related to time deposits was $622 and $937, respectively. For the six months ended June 30, 2024 and 2023, interest income related to time deposits was $1,246 and $1,912, respectively.

Financial Instruments

The Company periodically invests in equity securities, and maintains an investment portfolio of various holdings, types, and maturities. For equity investments that do not have a readily determinable fair value, the Company classified them as long-term investments, and records them using either: 1) the measurement alternative which measures the equity investments at cost minus impairment, if any, plus or minus changes resulting from qualifying observable price changes; or 2) the equity method whereby the Company recognizes its proportional share of the income or loss from the equity method investment. The equity method is utilized when the equity investments are common stock or in substance common stock,

and the Company does not have the ability to control the investee but is deemed to have the ability to exercise significant influence over the investee’s operating or financial policies. For equity investments that have a readily determinable fair value, the Company classified them as short-term investments, and records them at fair market value on a recurring basis based upon quoted market prices. Realized and unrealized gains and losses resulting from application of the measurement alternative, the impact of the application of the equity method to the Company’s equity investments, and recognition of changes in fair market value, as applicable, are recognized as non-operating income (expenses), net in the condensed consolidated statements of comprehensive income (loss).

The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact, and it considers assumptions that market participants would use when pricing the asset or liability.

A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value. The level of an asset or liability in the hierarchy is based on the lowest level of input that is significant to the fair value measurement. Assets and liabilities carried at fair value are classified and disclosed in one of the following three categories:

Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities with sufficient volume and frequency of transactions.

Level 2: Valuations based on observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active for identical assets or liabilities, or model-derived valuations techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3: Valuations based on unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities and based on non-binding, broker-provided price quotes and may not have been corroborated by observable market data.

The Company’s primary financial instruments include its cash, cash equivalents, short term and long term deposits, restricted cash, short-term and long-term investments, other receivables, accounts receivable, accounts payable, and short-term and long-term borrowings. The estimated fair value of cash and cash equivalents, short-term time deposits, accounts receivable, other receivables, accounts payable, and short-term borrowings approximates their carrying value due to the short period of time to their maturities.

All transfers between fair value hierarchy levels are recognized by the Company at the end of each reporting period. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value

measurement in its entirety, requires judgment and considers factors specific to the investment. The inputs or methodology

used for valuing financial instruments are not necessarily an indication of the risks associated with investment in those instruments.

Assets and liabilities measured at fair value on a recurring basis:


	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of June 30, 2024:
Assets
Cash and Cash equivalents	$	35,494	$	—	$	—	$	35,494
Short-term investments	19,597		—		—		19,597
	$	55,091	$	—	$	—	$	55,091
As of December 31, 2023:
Assets
Cash and Cash equivalents	$	37,518	$	—	$	—	$	37,518
Short-term investments	21,312		—		—		21,312
	$	58,830	$	—	$	—	$	58,830

Assets and liabilities measured at fair value on a non-recurring basis:


	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of December 31, 2023:
Assets
Investments accounted for using measurement alternative	$	—	$	—	$	10,378	$	10,378
	$	—	$	—	$	10,378	$	10,378

The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of June 30, 2024, and the Company did not recognize any unrealized gains (upward adjustments) or unrealized losses (downward adjustments) resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer for its long-term investments accounted for using measurement alternatives during the three and six months ended June 30, 2024 and 2023.

Refer to Note 12 for fair value information related to the Company’s outstanding long-term borrowings as of June 30, 2024 and December 31, 2023.

Basic and Diluted Net Income per Share of Common Stock

Basic and diluted net income per share of common stock are calculated as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Numerator:
Net income	$	31,399	$	33,597	$	53,491	$	42,560
Less: Net income attributable to non-controlling interests	7,189		6,772		11,848		8,590
Net income available to common stockholders, basic	$	24,210	$	26,825	$	41,643	$	33,970
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	525		303		920		395
Net income available to common stockholders, diluted	$	23,685	$	26,522	$	40,723	$	33,575

Weighted average shares outstanding, basic	62,178,369		59,898,149		61,772,776		59,817,903
Effect of dilutive securities	4,879,477		5,031,489		4,747,930		5,150,997
Weighted average shares outstanding, diluted	67,057,846		64,929,638		66,520,706		64,968,900

Net income per share of common stock:
Basic	$	0.39	$	0.45	$	0.67	$	0.57
Diluted	$	0.35	$	0.41	$	0.61	$	0.52

Basic and diluted net income per share of common stock is presented using the two-class method, which allocates undistributed earnings to common stock and any participating securities according to dividend rights and participation rights on a proportionate basis. Under the two-class method, basic net income per share of common stock is computed by dividing the sum of distributed and undistributed earnings attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. ACM Research did not have any participating securities outstanding during the three and six months ended June 30, 2024 and 2023.

ACM Research has been authorized to issue Class A and Class B common stock since redomesticating in Delaware in November 2016. The two classes of common stock are substantially identical in all material respects, except for voting rights. Since ACM Research did not declare cash dividends during the six months ended June 30, 2024 or 2023, the net income per share of common stock attributable to each class is the same under the “two-class” method. As such, the two classes of common stock have been presented on a combined basis in the condensed consolidated statements of comprehensive income (loss) and in the above computation of net income per share of common stock.

Diluted net income per share of common stock reflects the potential dilution from securities, such as stock options that could share in ACM Research’s earnings. Certain potential dilutive securities were excluded from the net income per share calculation because the impact would be anti-dilutive. The number of potentially dilutive shares that were not included in the calculation of diluted net income per share in the periods presented where their inclusion would be anti-dilutive were 702,850 and 714,850 stock options for the three and six months ended June 30, 2024, respectively, and 302,561 and 394,756 stock options for the three and six months ended June 30, 2023, respectively.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents, time deposits, and accounts receivable. The Company deposits and invests its cash and cash equivalents and time deposits with financial institutions that management believes are creditworthy.

The Company is potentially subject to concentrations of credit risks in its revenue and accounts receivable. For the three months ended June 30, 2024 and 2023, four customers accounted for 57.9% and three customers accounted for 52.1% of revenue, respectively. For the six months ended June 30, 2024 and 2023, three customers accounted for 51.9% and one customer accounted for 17.5% of revenue, respectively.

As of June 30, 2024 and December 31, 2023, four customers accounted for 55.9% and four customers accounted for 59.1%, respectively, of the Company’s accounts receivables. The Company believes that the receivable balances from these largest customers do not represent a significant credit risk based on past collection experience.

Recently issued accounting pronouncements not yet adopted

In November 2023, the FASB issued ASU No. 2023-07, Improvements to Reportable Segment Disclosures. This ASU updates reportable segment disclosure requirements by requiring disclosures of significant reportable segment expenses that are regularly provided to the Chief Operating Decision Maker (“CODM”) and included within each reported measure of a segment's profit or loss. This ASU also requires disclosure of the title and position of the individual identified as the CODM and an explanation of how the CODM uses the reported measures of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources. The ASU is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Adoption of the ASU should be applied retrospectively to all prior periods presented in the financial statements. Early adoption is also permitted. The Company is currently evaluating the provisions of this ASU and expect to adopt it for the year ending December 31, 2024.

In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures (Topic 740). The ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as additional information on income taxes paid. The ASU is effective on a prospective basis for annual periods beginning after December 15, 2024. Retrospective application is permitted. Early adoption is also permitted for annual financial statements that have not yet been issued or made available for issuance. The Company is currently evaluating the provisions of this ASU.

OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Long-term Liabilities [Abstract]
Other long-term liabilities	$ 5,505	$ 5,873
Subsidies commenced in 2020 and prior
Other Long-term Liabilities [Abstract]
Other long-term liabilities	769	1,107
Subsidies to SW Lingang R&D development commenced in 2021
Other Long-term Liabilities [Abstract]
Other long-term liabilities	3,433	3,467
Other
Other Long-term Liabilities [Abstract]
Other long-term liabilities	$ 1,303	$ 1,299

LEASES - Maturities of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Maturities of outstanding lease liabilities [Abstract]
remainder of 2024	$ 1,610
2025	2,082
2026	1,317
2027	1,177
2028 and thereafter	634
Total lease payments	6,820
Less: Interest	(568)
Present value of lease liabilities	$ 6,252

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The Company’s condensed consolidated financial statements include the accounts of ACM and its subsidiaries. ACM’s subsidiaries are those entities in which ACM, directly or indirectly, controls a majority of the voting power. All significant intercompany transactions and balances have been eliminated upon consolidation. The accompanying condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting on Form 10-Q. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the historical consolidated financial statements of the Company for the year ended December 31, 2023 included in ACM’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023. The accompanying condensed consolidated financial statements are unaudited. In the opinion of management, these unaudited condensed consolidated financial statements of the Company reflect all adjustments that are necessary for a fair presentation of the Company’s financial position and results of operations. Such adjustments are of a normal recurring nature, unless otherwise noted. The balance sheet as of June 30, 2024 and the results of operations for the three and six months ended June 30, 2024 are not necessarily indicative of the results to be expected for any future period.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the balance sheet date and the reported revenues and expenses during the reported period in the condensed consolidated financial statements and accompanying notes. The Company’s significant accounting estimates and assumptions include, but are not limited to, those used for revenue recognition and deferred revenue, the valuation and recognition of fair value of certain short-term investments and long-term investments, stock-based compensation arrangements, realization of deferred tax assets, assessment for impairment of long-lived assets and long-term investments, allowance for credit losses, inventory valuation, useful lives of property, plant and equipment and useful lives of intangible assets. Management evaluates these estimates and assumptions on a regular basis. Actual results could differ from those estimates and assumptions.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, bank deposits that are unrestricted as to withdrawal and use, and highly liquid investments with an original maturity date of three months or less at the date of purchase. At times, cash deposits may exceed government-insured limits. Cash held in the U.S. exceeds the Federal Deposit Insurance Corporation insurance limits and is subject to risk of loss. No losses have been experienced to date. Cash amounts held in mainland China are subject to a series of risk control regulatory standards from mainland China bank regulatory authorities. ACM’s subsidiaries in mainland China are required to obtain approval from the State Administration of Foreign Exchange (“SAFE”) to transfer funds into or out of mainland China. SAFE requires a valid agreement to approve the transfers, which are processed through a bank. Other than these mainland China foreign exchange restrictions, ACM’s subsidiaries in mainland China are not subject to any restrictions and limitations on its ability to transfer funds to ACM or among our other subsidiaries. However, cash held in mainland China does exceed applicable insurance limits and is subject to risk of loss, although no such losses have been experienced to date.
Time Deposits	Time Deposits Time deposits are deposited with banks in mainland China with fixed terms and interest rates which cannot be withdrawn before maturity, and are presented as short-term deposits and long-term deposits in the condensed consolidated financial statements based on their expected time of collection. They are also subject to the risk control regulatory standards described above upon maturity.
Financial Instruments	Financial Instruments The Company periodically invests in equity securities, and maintains an investment portfolio of various holdings, types, and maturities. For equity investments that do not have a readily determinable fair value, the Company classified them as long-term investments, and records them using either: 1) the measurement alternative which measures the equity investments at cost minus impairment, if any, plus or minus changes resulting from qualifying observable price changes; or 2) the equity method whereby the Company recognizes its proportional share of the income or loss from the equity method investment. The equity method is utilized when the equity investments are common stock or in substance common stock, and the Company does not have the ability to control the investee but is deemed to have the ability to exercise significant influence over the investee’s operating or financial policies. For equity investments that have a readily determinable fair value, the Company classified them as short-term investments, and records them at fair market value on a recurring basis based upon quoted market prices. Realized and unrealized gains and losses resulting from application of the measurement alternative, the impact of the application of the equity method to the Company’s equity investments, and recognition of changes in fair market value, as applicable, are recognized as non-operating income (expenses), net in the condensed consolidated statements of comprehensive income (loss). The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact, and it considers assumptions that market participants would use when pricing the asset or liability. A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value. The level of an asset or liability in the hierarchy is based on the lowest level of input that is significant to the fair value measurement. Assets and liabilities carried at fair value are classified and disclosed in one of the following three categories: Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities with sufficient volume and frequency of transactions. Level 2: Valuations based on observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active for identical assets or liabilities, or model-derived valuations techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Valuations based on unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities and based on non-binding, broker-provided price quotes and may not have been corroborated by observable market data. The Company’s primary financial instruments include its cash, cash equivalents, short term and long term deposits, restricted cash, short-term and long-term investments, other receivables, accounts receivable, accounts payable, and short-term and long-term borrowings. The estimated fair value of cash and cash equivalents, short-term time deposits, accounts receivable, other receivables, accounts payable, and short-term borrowings approximates their carrying value due to the short period of time to their maturities. All transfers between fair value hierarchy levels are recognized by the Company at the end of each reporting period. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement in its entirety, requires judgment and considers factors specific to the investment. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risks associated with investment in those instruments. The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of June 30, 2024, and the Company did not recognize any unrealized gains (upward adjustments) or unrealized losses (downward adjustments) resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer for its long-term investments accounted for using measurement alternatives during the three and six months ended June 30, 2024 and 2023.
Basic and Diluted Net Income per Share of Common Stock	Basic and diluted net income per share of common stock is presented using the two-class method, which allocates undistributed earnings to common stock and any participating securities according to dividend rights and participation rights on a proportionate basis. Under the two-class method, basic net income per share of common stock is computed by dividing the sum of distributed and undistributed earnings attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. ACM Research did not have any participating securities outstanding during the three and six months ended June 30, 2024 and 2023. ACM Research has been authorized to issue Class A and Class B common stock since redomesticating in Delaware in November 2016. The two classes of common stock are substantially identical in all material respects, except for voting rights. Since ACM Research did not declare cash dividends during the six months ended June 30, 2024 or 2023, the net income per share of common stock attributable to each class is the same under the “two-class” method. As such, the two classes of common stock have been presented on a combined basis in the condensed consolidated statements of comprehensive income (loss) and in the above computation of net income per share of common stock. Diluted net income per share of common stock reflects the potential dilution from securities, such as stock options that could share in ACM Research’s earnings. Certain potential dilutive securities were excluded from the net income per share calculation because the impact would be anti-dilutive. The number of potentially dilutive shares that were not included in the calculation of diluted net income per share in the periods presented where their inclusion would be anti-dilutive were 702,850 and 714,850 stock options for the three and six months ended June 30, 2024, respectively, and 302,561 and 394,756 stock options for the three and six months ended June 30, 2023, respectively.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents, time deposits, and accounts receivable. The Company deposits and invests its cash and cash equivalents and time deposits with financial institutions that management believes are creditworthy.
Recently issued accounting pronouncements not yet adopted	Recently issued accounting pronouncements not yet adopted In November 2023, the FASB issued ASU No. 2023-07, Improvements to Reportable Segment Disclosures. This ASU updates reportable segment disclosure requirements by requiring disclosures of significant reportable segment expenses that are regularly provided to the Chief Operating Decision Maker (“CODM”) and included within each reported measure of a segment's profit or loss. This ASU also requires disclosure of the title and position of the individual identified as the CODM and an explanation of how the CODM uses the reported measures of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources. The ASU is effective for annual periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Adoption of the ASU should be applied retrospectively to all prior periods presented in the financial statements. Early adoption is also permitted. The Company is currently evaluating the provisions of this ASU and expect to adopt it for the year ending December 31, 2024. In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures (Topic 740). The ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as additional information on income taxes paid. The ASU is effective on a prospective basis for annual periods beginning after December 15, 2024. Retrospective application is permitted. Early adoption is also permitted for annual financial statements that have not yet been issued or made available for issuance. The Company is currently evaluating the provisions of this ASU.

RELATED PARTY BALANCES AND TRANSACTIONS (Tables)

6 Months Ended

Jun. 30, 2024

Related Party Balances and Transactions

The following tables reflect related party transactions in our condensed consolidated financial statements:


Advances to related party	June 30, 2024		December 31, 2023
Ninebell	$	2,756	$	2,432


Accounts payable	June 30, 2024		December 31, 2023
Ninebell	$	12,247	$	7,624
Shengyi	5,765		3,783
Total	$	18,012	$	11,407


	Three Months Ended June 30,				Six Months Ended June 30,
Purchase of materials	2024		2023		2024		2023
Ninebell	$	13,778	$	10,604	$	27,930	$	27,001
Shengyi	2,349		706		3,341		2,679
Total	$	16,127	$	11,310	$	31,271	$	29,680


	Three Months Ended June 30,				Six Months Ended June 30,
Service fee charged by	2024		2023		2024		2023
Shengyi	$	154	$	452	$	227	$	730

STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

ACM’s stock-based compensation consists of employee and non-employee awards issued under its 1998 Stock Option Plan and its 2016 Omnibus Incentive Plan. The vesting condition may consist of a service period condition determined by the Board of Directors for a grant or certain performance conditions determined by the Board of Directors for a grant. The fair value of the stock options granted with a service period based condition and/or performance condition is estimated at the date of grant using the Black-Scholes option pricing model. The fair value of the stock options granted with a market based condition is estimated at the date of grant using the Monte Carlo simulation model.

Employee Awards

The following table summarizes the Company’s employee share option activities during the six months ended June 30, 2024:


	Number of Option Shares	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	9,998,637	$	5.15	$	9.59	6.17 years
Granted	194,500	17.27		23.16
Exercised	(1,205,938)	2.25		4.83
Forfeited/cancelled	(43,735)	11.08		23.34
Outstanding at June 30, 2024	8,943,464	$	5.77	$	10.33	6.03 years
Vested and exercisable at June 30, 2024	5,052,597

As of June 30, 2024, $25,217 of total unrecognized employee stock-based compensation expense, net of estimated forfeitures, related to employee stock-based awards for ACM were expected to be recognized over a weighted-average period of 3.6 years, after June 30, 2024. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures.

The aggregate intrinsic value of options exercised in the three and six months ended June 30, 2024 was $7,212 and $29,077. The aggregate intrinsic value of options outstanding and exercisable as of June 30, 2024 were $119,032 and $81,303, respectively.

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


			Six Months Ended June 30, 2024
Fair value of share of common stock(1)			$23.02-$31.92
Expected term in years(2)			5.81-6.25
Volatility(3)			84.87%-85.48%
Risk-free interest rate(4)			4.23%-4.49%
Expected dividend(5)			—%

(1)Fair value of Class A common stock value was closing market price of the Class A common stock on the grant date.

(2)Expected term of share options is based on the average of the vesting period and the contractual term for each grant.

(3)Volatility is calculated based on the historical volatility of ACM in the period equal to the expected term of each grant.

(4)Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the share options in effect at the time of grant.

(5)Expected dividend is assumed to be 0% as ACM has no history or expectation of paying a dividend on its common stock.

Non-employee Awards

The following table summarizes the Company’s non-employee share option activities during the six months ended June 30, 2024:


	Number of Option Shares	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	1,170,795	$	0.42	$	1.31	2.66 years
Exercised	(160,143)	0.22		0.50
Forfeited/cancelled	(3,188)	0.22		0.50
Outstanding at June 30, 2024	1,007,464	$	0.45	$	1.44	2.34 years
Vested and exercisable at June 30, 2024	1,007,464

As of June 30, 2024 $0 of total unrecognized non-employee stock-based compensation expense, net of estimated forfeitures, related to stock-based awards were expected to be recognized over a weighted-average period of 0 years, after June 30, 2024. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures.

The aggregate intrinsic value of options exercised in the three and six months ended June 30, 2024 was $1,511 and $4,267, respectively. The aggregate intrinsic value of options outstanding and exercisable as of June 30, 2024 was $21,778.

ACM Shanghai 2019 Option Grants

In January 2020, ACM Shanghai adopted a 2019 Stock Option Incentive Plan (the “2019 Subsidiary Stock Option Plan”) that provides for, among other incentives, the granting to officers, directors, and employees of options to purchase shares of ACM Shanghai’s common stock.

The following table summarizes the stock option activities of the ACM Shanghai 2019 Subsidiary Stock Option Plan during the six months ended June 30, 2024:


	Number of Option Shares in ACM Shanghai	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	3,134,883	$	0.24	$	1.85	0.85 years
Exercised	(446,154)	$	0.24	$	1.85
Forfeited/cancelled	(92,308)	$	0.24	$	1.85
Outstanding at June 30, 2024	2,596,421	$	0.24	$	1.85	0.51 years
Vested and exercisable at June 30, 2024	2,596,421

The aggregate intrinsic value of options exercised in the three and six months ended June 30, 2024 was both $5,198. The aggregate intrinsic value of options outstanding and exercisable as of June 30, 2024 was $26,124.

ACM Shanghai 2023 Option Grants

In June 2023, ACM Shanghai adopted a 2023 Stock Option Incentive Plan (the "2023 Subsidiary Stock Option Plan”) that provides for, among other incentives, the granting to officers, directors, and employees of options to purchase shares of ACM Shanghai’s common stock. The vesting conditions consist of service periods conditions and performance conditions

related to certain sales and research and development progress targets determined by the Board of Directors of ACM Shanghai.

The following table summarizes the ACM Shanghai 2023 Subsidiary Stock Option Plan’s stock option activities during the three months ended June 30, 2024:


	Number of Option Shares in ACM Shanghai	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	10,575,500	$	9.49	$	7.06	3.09 years
Granted	1,391,000	$	6.04	$	7.00
Forfeited/cancelled	(201,065)	$	9.09	$	7.06
Outstanding at June 30, 2024	11,765,435	$	9.01	$	7.00	2.70 years
Vested and exercisable at June 30, 2024	-

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


			Six Months Ended June 30, 2024
Fair value of share of common stock (1)			$4.93-$6.89
Expected term in years (2)			1.50-4.50
Volatility (3)			45.92%-56.18%
Risk-free interest rate (4)			1.50%-2.75%
Expected dividend (5)			—%

(1) Equal to closing value on the grant date.

(2) Expected term of share options is based on the average of the vesting period and the contractual term for each grant.

(3) Volatility is calculated based on the historical volatility of ACM Shanghai in the period equal to the expected term of each grant.

(4) Risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the share options in effect at the time of grant.

(5) Expected dividend is assumed to be 0% as the impact is adjusted on the value of share of common stock.

As of June 30, 2024, $60,798 of total unrecognized non-employee stock-based compensation expense, net of estimated forfeitures, related to ACM Shanghai stock-based awards were expected to be recognized over a weighted-average period of 1.7 years. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures.

The aggregate intrinsic value of options exercised in the three and six months ended June 30, 2024 was $0 as there were no options exercised during the periods. As there were no options exercisable during the periods, the aggregate intrinsic value of options outstanding and exercisable as of June 30, 2024 were $57,491 and $0, respectively.

The following table summarizes the components of stock-based compensation expense included in the condensed consolidated statements of comprehensive income (loss):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock-Based Compensation Expense:
Cost of revenue	$	792	$	125	$	1,573	$	250
Sales and marketing expense	3,024		431		6,051		862
Research and development expense	4,206		709		8,709		1,410
General and administrative expense	6,320		752		12,578		1,563
	$	14,342	$	2,017	$	28,911	$	4,085


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock-based compensation expense by type:
Employee stock purchase plan	$	2,389	$	1,975	$	4,742	$	3,993
Non-employee stock purchase plan	—		12		9		23
2019 and 2023 Subsidiary option grants	11,953		30		24,160		69
	$	14,342	$	2,017	$	28,911	$	4,085

INCOME TAXES

6 Months Ended

Jun. 30, 2024

Income Tax Disclosure [Abstract]

INCOME TAXES

Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period during which such rates are enacted.

The Company considers all available evidence to determine whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become realizable. Management considers the scheduled reversal of deferred tax liabilities (including the impact of available carryback and carry-forward periods) and projected taxable income in assessing the realizability of deferred tax assets. In making such judgments, significant weight is given to evidence that can be objectively verified.

As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. Prior to September 30, 2019, the Company had recorded a valuation allowance for the full amount of net deferred tax assets in the United States, as the realization of deferred tax assets was uncertain. Since September 30, 2019, the Company has not maintained a valuation allowance except for a partial valuation allowance on certain U.S. and foreign deferred tax assets. In order to recognize the remaining U.S. deferred tax assets that continue to be subject to a valuation allowance, the Company will need to generate sufficient U.S. taxable income in future periods before the expiration of the deferred tax assets governed by the tax code.

ACM Shanghai has shown a three-year historical cumulative profit and has projections of future income. As a result, the Company does not maintain a valuation allowance. The Company accounts for uncertain tax positions in accordance with the authoritative guidance on income taxes under which the Company may only recognize or continue to recognize tax positions that meet a more likely than not threshold. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as a component of the provision for income taxes.

The Company’s effective tax rate differs from statutory rates of 21% for U.S. federal income tax purposes and 15% to 25% for Chinese income tax purposes due to the effects of the valuation allowance and certain permanent differences from book-tax differences, including stock based compensation, deemed dividend income under Subchapter F of the U.S. Internal Revenue Code of 1986, as amended (Subpart F), and global intangible low-taxed income (GILTI) inclusions, and

R&D super deduction. As a result, the Company recorded income tax expense of $13,705 and $10,517 during the six months ended June 30, 2024 and 2023, respectively. The decrease in the Company's effective income tax rate for the six months ended June 30, 2024 compared to the same period of the prior year was primarily due to an increased benefit from certain permanent deductions in a foreign jurisdiction.

Under the change in Section 174 made by the Tax Cuts and Jobs Act of 2017 which became effective on January 1, 2022, the Company is required to capitalize, and subsequently amortize R&D expenses over fifteen years for research activities conducted outside of the U.S. The capitalization of overseas R&D expenses results in a significant increase in the Company’s global intangible low-taxed income inclusion.

The Company had total unrecognized tax benefits of $13,026 as of both June 30, 2024 and December 31, 2023. If recognized, the net impact to effective rate, after indirect offset, would be $12,943. The Company did not expect any reversal of unrecognized tax benefits in the next 12 months. The Company will recognize interest and penalties, when they occur, related to uncertain tax provisions as a component of tax expense. For the six months ended June 30, 2024 and 2023, $677 and $569 of interest and penalties was recognized, respectively.

The Company is subject to taxation in the United States, state, and foreign jurisdictions. All tax returns will remain open for examination by the federal and state authorities for three and four years, respectively, from the date of utilization of any net operating loss or credits. Certain tax years are subject to foreign income tax examinations by tax authorities until the statute of limitations expire.

The Company’s four principal mainland China subsidiaries, ACM Shanghai, ACM Wuxi, ACM Beijing and ACM Lingang, are liable for mainland China corporate income taxes at the rates of 15%, 25%, 25% and 15%, respectively. Pursuant to the Corporate Income Tax Law of mainland China, ACM’s mainland China subsidiaries generally would be liable for mainland China corporate income taxes as a rate of 25%. According to Guoshuihan 2009 No. 203, an entity certified as an “advanced and new technology enterprise” is entitled to a preferential income tax rate of 15%. ACM Shanghai was certified as an “advanced and new technology enterprise” in 2012 and again in 2016, 2018, and 2021, with an effective period of three years and is expected to be re-certified for future years in 2024. In 2021, ACM Shanghai was certified as an eligible integrated circuit production enterprise and was entitled to a preferential income tax rate of 12.5% from January 1, 2020 to December 31, 2022. Certain entities which meet requirements according to the Policy of the Lingang New area in China (Shanghai) Pilot Free Trade Zone are entitled to a preferential income tax rate of 15%. ACM Lingang was certified for this in 2021, and this preferential income tax rate is valid from January 1, 2020 until December 31, 2024.

Income tax expense was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Total income tax expense	$	(9,336)	$	(7,638)	$	(13,705)	$	(10,517)

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

INVENTORIES (Tables)

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

Inventories

At June 30, 2024 and December 31, 2023, inventories consisted of the following:


	June 30, 2024		December 31, 2023
Raw materials	$	248,443	$	235,062
Work-in-process	75,569		81,438
Finished goods	278,915		228,895
Total inventory, net	$	602,927	$	545,395

RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Purchase of materials	$ 16,127	$ 11,310	$ 31,271	$ 29,680
Cost of revenue, related party	105,696	75,938	178,766	110,208
Ninebell
Related Party Transaction [Line Items]
Purchase of materials	13,778	10,604	27,930	27,001
Shengyi
Related Party Transaction [Line Items]
Purchase of materials	2,349	706	3,341	2,679
Related Party
Related Party Transaction [Line Items]
Advances to related party	2,756		2,756		$ 2,432
Accounts payable	18,012		18,012		11,407
Cost of revenue, related party	16,100	11,300	31,300	29,700
Related Party \| Ninebell
Related Party Transaction [Line Items]
Advances to related party	2,756		2,756		2,432
Accounts payable	12,247		12,247		7,624
Related Party \| Shengyi
Related Party Transaction [Line Items]
Accounts payable	5,765		5,765		$ 3,783
Cost of revenue, related party	$ 154	$ 452	$ 227	$ 730

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

+ Details

OTHER PAYABLES AND ACCRUED EXPENSES (Tables)

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Other Payables and Accrued Expenses

At June 30, 2024 and December 31, 2023, other payables and accrued expenses consisted of the following:


	June 30, 2024		December 31, 2023
Accrued commissions	$	17,814	$	15,572
Accrued warranty	11,273		9,834
Accrued payroll	13,062		14,840
Accrued professional fees	713		696
Accrued machine testing fees	1,581		1,762
Accrued machine sales fees	6,411		6,010
Accrued Lingang construction fees	33,447		33,729
Others	30,639		20,508
Total	$	114,940	$	102,951

Schedule of Product Warranty Liability

Changes in the Company’s accrued warranty were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Balance at beginning of period	$	11,339	$	9,240	$	9,834	$	8,780
Additions	2,802		1,682		$	5,098	$	2,510
Utilized	(2,868)		(1,743)		$	(3,659)	$	(2,111)
Balance at end of period	$	11,273	$	9,179	$	11,273	$	9,179

DESCRIPTION OF BUSINESS

6 Months Ended

Jun. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS

ACM Research, Inc. (“ACM” or “ACM Research”) and its subsidiaries (collectively with ACM, the “Company”) develop, manufacture and sell capital equipment to the global semiconductor industry.

The Company has direct or indirect interests in the following subsidiaries:


			Effective interest held as at
Name of subsidiaries	Place and date of incorporation	Principal Activities	June 30, 2024		December 31, 2023
ACM Research (Shanghai), Inc. ("ACM Shanghai")	Mainland China, May 2005	Principal operating subsidiary	82.0	%	82.1	%
ACM Research (Wuxi), Inc. ("ACM Wuxi")	Mainland China, July 2011	Sales and services	82.0	%	82.1	%
CleanChip Technologies Limited ("CleanChip")	Hong Kong, June 2017	Trading partner between ACM Shanghai and its customers	82.0	%	82.1	%
ACM Research Korea CO., LTD.	Korea, December 2017	Sales, marketing, R&D, production	82.0	%	82.1	%
ACM Research ( Lingang), Inc. ("ACM Lingang") (1)	Mainland China, March 2019	Management of production activities	82.0	%	82.1	%
ACM Research (CA), Inc. ("ACM California")	USA, April 2019	Procurement for ACM Shanghai	82.0	%	82.1	%
ACM Research (Cayman), Inc.	Cayman Islands, April 2019	Administrative function (inactive)	100.0	%	100.0	%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")	Singapore, August 2021	Sales, marketing, business development	100.0	%	100.0	%
ACM Research (Beijing), Inc. ("ACM Beijing")	Mainland China, February 2022	Sales, marketing, business development	82.0	%	82.1	%
Hanguk ACM CO., LTD	Korea, March 2022	Sales, services, business development	100.0	%	100.0	%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, June 2023	Business development	82.0	%	82.1	%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	59.3	%	59.4	%

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 24,210	$ 26,825	$ 41,643	$ 33,970

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

LONG-TERM INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2024

Long-Term Investments [Abstract]

Long-Term Investment

Equity investee:

Initial investment dates

Investment entity

Percent ownership by ACM and subsidiaries

Investment purchase price

Ninebell Co., Ltd. ("Ninebell")

September 2017

ACM

20.0%

1,200

Wooil Flucon Co. ("Wooil")

August 2022

ACM Singapore

20.0%

1,000

Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital FundPartnership (LP) (“Hefei Shixi”)

September 2019

ACM Shanghai

10.0%

RMB 30,000 ($4,200)

Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")

June 2019

ACM Shanghai

14.0%

109

Company D

February 2024

ACM Shanghai

16.7%

RMB 30,000 ($4,230)

Investments accounted for using measurement alternative:

Waferworks (Shanghai) Co., Ltd. (“Waferworks”)

October 2021

ACM Shanghai

0.3%

1,568

Shengyi

September 2023

ACM Shanghai

1.0%

RMB 6,100 ($860)

Company A

September 2023

ACM Shanghai

4.4%

RMB 30,000 ($4,200)

Company B

November 2023

ACM Shanghai

1.4%

RMB 6,600 ($930)

Company C

February 2024

ACM Shanghai

5.0%

RMB 12,500 ($1,760)

Company E

April 2024

ACM Shanghai

0.6%

RMB 10,000 ($1,403)


Equity investee:	June 30, 2024		December 31, 2023
Ninebell	$	5,923	$	5,632
Wooil	975		1,003
Shengyi	2,257		1,693
Hefei Shixi	6,469		9,174
Company D	4,209		—
Subtotal	19,833		17,502
Investments accounted for using measurement alternative:
Waferworks	—		1,412
Shengyi	852		857
Company A	4,209		4,236
Company B	926		932
Company C	1,754		—
Company E	1,403		—
Other	2,921		2,941
Subtotal measurement alternative	12,065		10,378
Total	31,898		27,880

LAND USE RIGHT, NET (Tables)

6 Months Ended

Jun. 30, 2024

Land Use Right, Net [Abstract]

Land Use Rights

A summary of land use right is as follows:


	June 30, 2024		December 31, 2023
Land use right purchase amount	$	8,939	$	8,996
Less: accumulated amortization	(714)		(629)
Land use right, net	$	8,225	$	8,367

Annual Amortization of Land Use Right

The annual amortization of land use right is as follows:


Year ending December 31,
remainder of 2024	$	90
2025	179
2026	179
2027	179
2028	179
2029 and thereafter	7,419
Total	$	8,225

LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash outflow from operating leases	$ 1,031	$ 1,252	$ 2,004	$ 1,740
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 541	$ 0	$ 621	$ 6,592

STOCK-BASED COMPENSATION, Assumptions Used to Determine Fair Value of Share Options Granted (Details) - Employee Share Option	6 Months Ended
	Jun. 30, 2024 $ / shares
Service Period Based
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility minimum	84.87%
Volatility maximum	85.48%
Risk free interest rate minimum	4.23%
Risk free interest rate maximum	4.49%
Expected dividend rate	0.00%
Service Period Based \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)	$ 23.02
Expected term	5 years 9 months 21 days
Service Period Based \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)	$ 31.92
Expected term	6 years 3 months
2023 Subsidiary Stock Option Plan \| ACM Shanghai
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility minimum	45.92%
Volatility maximum	56.18%
Risk free interest rate minimum	1.50%
Risk free interest rate maximum	2.75%
Expected dividend rate	0.00%
2023 Subsidiary Stock Option Plan \| Minimum \| ACM Shanghai
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)	$ 4.93
Expected term	1 year 6 months
2023 Subsidiary Stock Option Plan \| Maximum \| ACM Shanghai
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)	$ 6.89
Expected term	4 years 6 months

OTHER PAYABLES AND ACCRUED EXPENSES - Schedule of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 11,339	$ 9,240	$ 9,834	$ 8,780
Additions	2,802	1,682	5,098	2,510
Utilized	(2,868)	(1,743)	(3,659)	(2,111)
Balance at end of period	$ 11,273	$ 9,179	$ 11,273	$ 9,179

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2024	Aug. 02, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-38273
Entity Registrant Name	ACM Research, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3290283
Entity Address, Address Line One	42307 Osgood Road, Suite I
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94539
City Area Code	510
Local Phone Number	445-3700
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	ACMR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001680062
Document Fiscal Year Focus	2024
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		57,449,013
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,021,811

LAND USE RIGHT, NET - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Land Use Right, Net [Abstract]
Amortization	$ 42	$ 38	$ 85	$ 88

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cost of revenue, related party	$ 105,696	$ 75,938	$ 178,766	$ 110,208
Related Party
Cost of revenue, related party	$ 16,100	$ 11,300	$ 31,300	$ 29,700

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

+ Details

ACCOUNTS RECEIVABLE

6 Months Ended

Jun. 30, 2024

Receivables [Abstract]

ACCOUNTS RECEIVABLE

At June 30, 2024 and December 31, 2023, accounts receivable consisted of the following:


	June 30, 2024		December 31, 2023
Accounts receivable	$	300,283	$	288,016
Less: Allowance for credit losses	(6,784)		(4,830)
Total accounts receivable, net	$	293,499	$	283,186

The $10.3 million increase in accounts receivable, net for the first six months of 2024 corresponds to a $135.8 million increase in revenue compared to the six months ended June 30, 2023.

The movement of the allowance for credit losses for the six months ended June 30, 2024 is as follows:



Allowance for credit losses, before tax, as of December 31, 2023
Provision for credit losses
Allowance for credit losses, before tax, as of June 30, 2024


June 30, 2024
$	(4,830)
(1,954)
$	(6,784)

The Company assesses collectability by reviewing accounts receivable on a general basis where similar characteristics exist and on an individual basis when the Company identifies specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considers historical collectability based on past due status, the age of the accounts receivable balances, credit quality of the Company’s customers based on ongoing credit evaluations, current economic conditions, reasonable and supportable forecasts of future economic conditions, and other factors that may affect the Company’s ability to collect from customers.

OTHER PAYABLES AND ACCRUED EXPENSES - Other Payables and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued commissions	$ 17,814	$ 15,572
Accrued warranty	11,273	9,834
Accrued payroll	13,062	14,840
Accrued professional fees	713	696
Accrued machine testing fees	1,581	1,762
Accrued machine sales fees	6,411	6,010
Accrued Lingang construction fees	33,447	33,729
Others	30,639	20,508
Total	$ 114,940	$ 102,951

LONG-TERM INVESTMENTS - Narrative (Details) ¥ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 CNY (¥)	Jan. 19, 2024 USD ($)	Jan. 19, 2024 CNY (¥)	Jan. 12, 2024 USD ($)	Jan. 12, 2024 CNY (¥)
Investments [Abstract]
Income (loss) from equity method investments (note 15)	$ (695)	$ 3,920	$ (1,215)	$ 3,888
Proceeds from Equity Method Investment, Distribution, Return of Capital	0	$ 5,095	600	$ 5,095
Company C \| Common Stock Class A
Investments [Abstract]
Investment purchase price	1,760		1,760		¥ 12,500			$ 1,760	¥ 12,500
Percent ownership by ACM and subsidiaries								5.00%	5.00%
Company D \| Common Stock Class A
Investments [Abstract]
Investment purchase price	$ 4,230		$ 4,230		¥ 30,000	$ 4,230	¥ 30,000
Percent ownership by ACM and subsidiaries	16.70%		16.70%		16.70%	16.70%	16.70%
Company E \| Common Stock Class A
Investments [Abstract]
Investment purchase price	$ 1,403		$ 1,403		¥ 10,000	$ 1,403	¥ 10,000
Percent ownership by ACM and subsidiaries	0.60%		0.60%		0.60%

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References + Details

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

+ References + Details

COMMON STOCK	6 Months Ended
COMMON STOCK	Jun. 30, 2024
Equity [Abstract]
COMMON STOCK	COMMON STOCK ACM is authorized to issue 150,000,000 shares of Class A common stock and 5,307,816 shares of Class B common stock, each with a par value of $0.0001. Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to twenty votes and is convertible at any time into one share of Class A common stock. Shares of Class A common stock and Class B common stock are treated equally, identically and ratably with respect to any dividends declared by the Board of Directors of ACM unless such Board of Directors declares different dividends to the Class A common stock and Class B common stock, which is subject to approval from a majority of common stockholders. During the three months ended June 30, 2024, ACM issued 415,476 shares of Class A common stock upon option exercises by employees and non-employees. During the six months ended June 30, 2024, ACM issued 1,366,081 shares of Class A common stock upon option exercises by employees and non-employees. During the three months ended June 30, 2023, ACM issued 133,135 shares of Class A common stock upon option exercises by employees and non-employees. During the six months ended June 30, 2023, ACM issued 296,204 shares of Class A common stock upon option exercises by employees and non-employees At June 30, 2024 and December 31, 2023, the number of shares of Class A common stock issued and outstanding was 57,402,253 and 56,036,172, respectively. At June 30, 2024 and December 31, 2023, the number of shares of Class B common stock issued and outstanding was 5,021,811 and 5,021,811, respectively.

- Definition

The entire disclosure for equity.

+ References

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+ Details

SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Jun. 30, 2024
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSOn July 30, 2024, the Company entered into an agreement to acquire a commercial facility, comprised of 39,500 square foot total floor space and which includes a 5,200 square foot functional clean room, for a price of $7.75 million. This facility is located in the City of Hillsboro in Oregon, and is intended to further expand ACM’s R&D and demonstration capability in the U.S. market. The purchase is scheduled to close in the fourth quarter of 2024.

LONG-TERM BORROWINGS (Tables)

6 Months Ended

Jun. 30, 2024

Long-Term Debt, by Current and Noncurrent [Abstract]

Long-Term Borrowings

At June 30, 2024 and December 31, 2023, long-term borrowings consisted of the following:


	June 30, 2024		December 31, 2023
Loan from China Merchants Bank	$	12,441	$	13,362
Loans from Bank of China	17,370		5,013
Loan from Bank of Shanghai	14,040		14,120
Loans from China CITIC Bank	28,043		28,240
Loan from China Everbright Bank	18,610		—
Less: Current portion	(19,671)		(6,783)
Total	$	70,833	$	53,952

Principal Payments for Outstanding Long-Term Loan

Scheduled principal payments for the outstanding long-term loan, including the current portion, as of June 30, 2024 are as follows:


Year ending December 31
remainder of 2024	$	4,690
2025	$	43,952
2026	1,989
2027	33,829
2028	1,994
Thereafter	4,050
	$	90,504

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Time Deposits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Deposits Assets [Line Items]
Short-term and long-term time deposits	$ 41,839		$ 41,839		$ 121,342
Interest income, deposits with financial institutions	622	$ 937	$ 1,912	$ 1,246
Deposit in China Merchant Bank which matured on January 29, 2024 with an annual interest rate of 2.85%
Deposits Assets [Line Items]
Time deposits, interest rate			2.85%
Short-term and long-term time deposits	0		$ 0		29,797
Deposit in Bank of Ningbo which matured on February 17, 2024 with an annual interest rate of 2.85%
Deposits Assets [Line Items]
Time deposits, interest rate			2.85%
Short-term and long-term time deposits	0		$ 0		44,630
Deposit in Shanghai Pudong Development Bank which was redeemed on June 20, 2024 with an annual interest rate of 3.10%
Deposits Assets [Line Items]
Time deposits, interest rate			3.10%
Short-term and long-term time deposits	0		$ 0		7,322
Deposit in Shanghai Pudong Development Bank which was redeemed on May 28, 2024 with an annual interest rate of 3.10%
Deposits Assets [Line Items]
Time deposits, interest rate			3.10%
Short-term and long-term time deposits	0		$ 0		7,307
Deposit in Shanghai Pudong Development Bank which was redeemed on March 7, 2024 with an annual interest rate of 3.10%
Deposits Assets [Line Items]
Time deposits, interest rate			3.10%
Short-term and long-term time deposits	0		$ 0		4,376
Deposit in Shanghai Pudong Development Bank which was redeemed on March 22, 2024 with an annual interest rate of 3.10%
Deposits Assets [Line Items]
Time deposits, interest rate			3.10%
Short-term and long-term time deposits	0		$ 0		4,373
Deposit in Shanghai Pudong Development Bank which was redeemed on January 29, 2024 with an annual interest rate of 3.10%
Deposits Assets [Line Items]
Time deposits, interest rate			3.10%
Short-term and long-term time deposits	0		$ 0		2,912
Deposit in China Industrial Bank which matures on January 30, 2026 with an annual interest rate of 3.15%
Deposits Assets [Line Items]
Time deposits, interest rate			3.15%
Short-term and long-term time deposits	14,656		$ 14,656		14,528
Deposit in China Everbright Bank which matured on January 5, 2024 with an annual interest rate of 5.38%
Deposits Assets [Line Items]
Time deposits, interest rate			5.38%
Short-term and long-term time deposits	0		$ 0		3,079
Deposit in China Everbright Bank which matured on May 22, 2024 with an annual interest rate of 5.28%
Deposits Assets [Line Items]
Time deposits, interest rate			5.28%
Short-term and long-term time deposits	0		$ 0		3,018
Deposit in China Everbright Bank which matures on July 8, 2024 with an annual interest rate of 5.29%
Deposits Assets [Line Items]
Time deposits, interest rate			5.29%
Short-term and long-term time deposits	3,036		$ 3,036		0
Deposit in China Everbright Bank which matures on November 23, 2024 with an annual interest rate of 5.28%
Deposits Assets [Line Items]
Time deposits, interest rate			5.28%
Short-term and long-term time deposits	10,055		$ 10,055		0
Deposit in Bank of Ningbo which matures on September 11, 2024 with an annual interest rate of 1.50%
Deposits Assets [Line Items]
Time deposits, interest rate			1.50%
Short-term and long-term time deposits	$ 14,092		$ 14,092		$ 0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

Cash and Cash Equivalents

The following table presents cash and cash equivalents, according to jurisdiction as of June 30, 2024 and December 31, 2023:


	June 30, 2024		December 31, 2023
United States	$	40,515	$	43,614
Mainland China	87,733		70,418
China Hong Kong	194,979		64,057
Korea	737		3,934
Singapore	67		67
Total	$	324,031	$	182,090

Summary of Time Deposits

At June 30, 2024 and December 31, 2023, time deposits consisted of the following:


	June 30, 2024		December 31, 2023
Deposit in China Merchant Bank which matured on January 29, 2024 with an annual interest rate of 2.85%	$	—	$	29,797
Deposit in Bank of Ningbo which matured on February 17, 2024 with an annual interest rate of 2.85%	$	—	$	44,630
Deposit in Shanghai Pudong Development Bank which was redeemed on June 20, 2024 with an annual interest rate of 3.10%	$	—	$	7,322
Deposit in Shanghai Pudong Development Bank which was redeemed on May 28, 2024 with an annual interest rate of 3.10%	$	—	$	7,307
Deposit in Shanghai Pudong Development Bank which was redeemed on March 7, 2024 with an annual interest rate of 3.10%	$	—	$	4,376
Deposit in Shanghai Pudong Development Bank which was redeemed on March 22, 2024 with an annual interest rate of 3.10%	$	—	$	4,373
Deposit in Shanghai Pudong Development Bank which was redeemed on January 29, 2024 with an annual interest rate of 3.10%	$	—	$	2,912
Deposit in China Industrial Bank which matures on January 30, 2026 with an annual interest rate of 3.15%	$	14,656	$	14,528
Deposit in China Everbright Bank which matured on January 5, 2024 with an annual interest rate of 5.38%	$	—	$	3,079
Deposit in China Everbright Bank which matured on May 22, 2024 with an annual interest rate of 5.28%	$	—	$	3,018
Deposit in China Everbright Bank which matures on July 8, 2024 with an annual interest rate of 5.29%	$	3,036	$	—
Deposit in China Everbright Bank which matures on November 23, 2024 with an annual interest rate of 5.28%	$	10,055	$	—
Deposit in Bank of Ningbo which matures on September 11, 2024 with an annual interest rate of 1.50%	$	14,092	$	—
	$	41,839	$	121,342

Fair Value, by Balance Sheet Grouping

Assets and liabilities measured at fair value on a recurring basis:


	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of June 30, 2024:
Assets
Cash and Cash equivalents	$	35,494	$	—	$	—	$	35,494
Short-term investments	19,597		—		—		19,597
	$	55,091	$	—	$	—	$	55,091
As of December 31, 2023:
Assets
Cash and Cash equivalents	$	37,518	$	—	$	—	$	37,518
Short-term investments	21,312		—		—		21,312
	$	58,830	$	—	$	—	$	58,830

Assets and liabilities measured at fair value on a non-recurring basis:


	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of December 31, 2023:
Assets
Investments accounted for using measurement alternative	$	—	$	—	$	10,378	$	10,378
	$	—	$	—	$	10,378	$	10,378

Basic and Diluted Net Income per Common Share

Basic and diluted net income per share of common stock are calculated as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Numerator:
Net income	$	31,399	$	33,597	$	53,491	$	42,560
Less: Net income attributable to non-controlling interests	7,189		6,772		11,848		8,590
Net income available to common stockholders, basic	$	24,210	$	26,825	$	41,643	$	33,970
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	525		303		920		395
Net income available to common stockholders, diluted	$	23,685	$	26,522	$	40,723	$	33,575

Weighted average shares outstanding, basic	62,178,369		59,898,149		61,772,776		59,817,903
Effect of dilutive securities	4,879,477		5,031,489		4,747,930		5,150,997
Weighted average shares outstanding, diluted	67,057,846		64,929,638		66,520,706		64,968,900

Net income per share of common stock:
Basic	$	0.39	$	0.45	$	0.67	$	0.57
Diluted	$	0.35	$	0.41	$	0.61	$	0.52

Commitments and Contingencies (Details) $ in Thousands, ¥ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) legalProceeding	Jun. 30, 2024 CNY (¥)	Jun. 30, 2024 CNY (¥) legalProceeding	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation	$ 16,293			$ 30,936
Other commitment	$ 16,737			$ 7,413
Land use rights period	7 years	7 years
Annual total taxes	$ 22,000	¥ 157.6
Security deposit refund percentage	20.00%		20.00%
Security deposit	$ 400		¥ 2.5
Number of outstanding legal proceedings \| legalProceeding	0		0

PROPERTY, PLANT AND EQUIPMENT, NET (Tables)

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

At June 30, 2024 and December 31, 2023, property, plant and equipment consisted of the following:


	June 30, 2024		December 31, 2023
Buildings and plants	$	82,579	$	83,109
Manufacturing equipment	17,235		16,556
Office equipment	5,260		4,953
Transportation equipment	401		404
Leasehold improvement	8,075		7,889
Total cost	113,550		112,911
Less: Total accumulated depreciation and amortization	(21,194)		(17,503)
Construction in progress	136,375		106,440
Total property, plant and equipment, net	$	228,731	$	201,848

STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Share Option Activities

The following table summarizes the Company’s employee share option activities during the six months ended June 30, 2024:


	Number of Option Shares	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	9,998,637	$	5.15	$	9.59	6.17 years
Granted	194,500	17.27		23.16
Exercised	(1,205,938)	2.25		4.83
Forfeited/cancelled	(43,735)	11.08		23.34
Outstanding at June 30, 2024	8,943,464	$	5.77	$	10.33	6.03 years
Vested and exercisable at June 30, 2024	5,052,597

The following table summarizes the Company’s non-employee share option activities during the six months ended June 30, 2024:


	Number of Option Shares	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	1,170,795	$	0.42	$	1.31	2.66 years
Exercised	(160,143)	0.22		0.50
Forfeited/cancelled	(3,188)	0.22		0.50
Outstanding at June 30, 2024	1,007,464	$	0.45	$	1.44	2.34 years
Vested and exercisable at June 30, 2024	1,007,464

The following table summarizes the stock option activities of the ACM Shanghai 2019 Subsidiary Stock Option Plan during the six months ended June 30, 2024:


	Number of Option Shares in ACM Shanghai	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	3,134,883	$	0.24	$	1.85	0.85 years
Exercised	(446,154)	$	0.24	$	1.85
Forfeited/cancelled	(92,308)	$	0.24	$	1.85
Outstanding at June 30, 2024	2,596,421	$	0.24	$	1.85	0.51 years
Vested and exercisable at June 30, 2024	2,596,421

The following table summarizes the ACM Shanghai 2023 Subsidiary Stock Option Plan’s stock option activities during the three months ended June 30, 2024:


	Number of Option Shares in ACM Shanghai	Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023	10,575,500	$	9.49	$	7.06	3.09 years
Granted	1,391,000	$	6.04	$	7.00
Forfeited/cancelled	(201,065)	$	9.09	$	7.06
Outstanding at June 30, 2024	11,765,435	$	9.01	$	7.00	2.70 years
Vested and exercisable at June 30, 2024	-

Assumptions Used to Determine Fair Value of Options Granted

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


			Six Months Ended June 30, 2024
Fair value of share of common stock(1)			$23.02-$31.92
Expected term in years(2)			5.81-6.25
Volatility(3)			84.87%-85.48%
Risk-free interest rate(4)			4.23%-4.49%
Expected dividend(5)			—%

(1)Fair value of Class A common stock value was closing market price of the Class A common stock on the grant date.

(2)Expected term of share options is based on the average of the vesting period and the contractual term for each grant.

(3)Volatility is calculated based on the historical volatility of ACM in the period equal to the expected term of each grant.

(4)Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the share options in effect at the time of grant.

(5)Expected dividend is assumed to be 0% as ACM has no history or expectation of paying a dividend on its common stock.

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


			Six Months Ended June 30, 2024
Fair value of share of common stock (1)			$4.93-$6.89
Expected term in years (2)			1.50-4.50
Volatility (3)			45.92%-56.18%
Risk-free interest rate (4)			1.50%-2.75%
Expected dividend (5)			—%

(1) Equal to closing value on the grant date.

(2) Expected term of share options is based on the average of the vesting period and the contractual term for each grant.

(3) Volatility is calculated based on the historical volatility of ACM Shanghai in the period equal to the expected term of each grant.

(4) Risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the share options in effect at the time of grant.

(5) Expected dividend is assumed to be 0% as the impact is adjusted on the value of share of common stock.

Summary of Components of Stock-based Compensation Expense

The following table summarizes the components of stock-based compensation expense included in the condensed consolidated statements of comprehensive income (loss):


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock-Based Compensation Expense:
Cost of revenue	$	792	$	125	$	1,573	$	250
Sales and marketing expense	3,024		431		6,051		862
Research and development expense	4,206		709		8,709		1,410
General and administrative expense	6,320		752		12,578		1,563
	$	14,342	$	2,017	$	28,911	$	4,085


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Stock-based compensation expense by type:
Employee stock purchase plan	$	2,389	$	1,975	$	4,742	$	3,993
Non-employee stock purchase plan	—		12		9		23
2019 and 2023 Subsidiary option grants	11,953		30		24,160		69
	$	14,342	$	2,017	$	28,911	$	4,085

LAND USE RIGHT, NET

6 Months Ended

Jun. 30, 2024

Land Use Right, Net [Abstract]

LAND USE RIGHT, NET

A summary of land use right is as follows:


	June 30, 2024		December 31, 2023
Land use right purchase amount	$	8,939	$	8,996
Less: accumulated amortization	(714)		(629)
Land use right, net	$	8,225	$	8,367

The amortization for the three months ended June 30, 2024 and 2023 was $42 and $38, respectively, and the six months ended June 30, 2024 and 2023 was $85 and $88.

The annual amortization of land use right is as follows:


Year ending December 31,
remainder of 2024	$	90
2025	179
2026	179
2027	179
2028	179
2029 and thereafter	7,419
Total	$	8,225

COMMON STOCK (Details)	3 Months Ended		6 Months Ended
COMMON STOCK (Details)	Jun. 30, 2024 vote $ / shares shares	Jun. 30, 2023 shares	Jun. 30, 2024 vote $ / shares shares	Jun. 30, 2023 shares	Mar. 31, 2024 shares	Dec. 31, 2023 shares	Mar. 31, 2023 shares	Dec. 31, 2022 shares
Common Stock Class A
Class of Stock Disclosures [Abstract]
Common stock, shares authorized (in shares)	150,000,000		150,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001		$ 0.0001
Number of votes for each share entitled \| vote	1		1
Exercise of stock options (in shares)		133,135	1,366,081
Common stock issued (in shares)	57,402,253		57,402,253			56,036,172
Common stock outstanding (in shares)	57,402,253		57,402,253			56,036,172
Class B Common Stock
Class of Stock Disclosures [Abstract]
Common stock, shares authorized (in shares)	5,307,816		5,307,816
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001		$ 0.0001
Number of votes for each share entitled \| vote	20		20
Shares converted			1
Common stock issued (in shares)	5,021,811		5,021,811			5,021,811
Common stock outstanding (in shares)	5,021,811		5,021,811			5,021,811
Common Stock \| Common Stock Class A
Class of Stock Disclosures [Abstract]
Exercise of stock options (in shares)	415,476	133,135	1,366,081	296,204
Common stock outstanding (in shares)	57,402,253	54,951,490	57,402,253	54,951,490	56,986,777	56,036,172	54,818,355	54,655,286
Common Stock \| Class B Common Stock
Class of Stock Disclosures [Abstract]
Common stock outstanding (in shares)	5,021,811	5,021,811	5,021,811	5,021,811	5,021,811	5,021,811	5,021,811	5,021,811

SEGMENT INFORMATION (Details) $ in Thousands	6 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Jun. 30, 2024 USD ($) segment	Dec. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	1
Number of operating segments \| segment	1
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 254,125	$ 223,191
Mainland China
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	241,246	209,725
Korea
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	11,631	12,190
United States
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 1,248	$ 1,276

SHORT-TERM INVESTMENTS - Summary of Trading Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Cost	$ 21,045	$ 20,155
Market value	$ 19,597	$ 21,312

STOCK-BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 14,342	$ 2,017	$ 28,911	$ 4,085
Employee Stock Option Plan
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	2,389	1,975	4,742	3,993
Employee Stock Option Plan \| ACM Shanghai
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	11,953	30	24,160	69
Non-Employee Stock Option Plan
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	0	12	9	23
Cost of revenue
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	792	125	1,573	250
Sales and marketing expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	3,024	431	6,051	862
Research and development expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	4,206	709	8,709	1,410
General and administrative expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 6,320	$ 752	$ 12,578	$ 1,563

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 53,491	$ 42,560
Adjustments to reconcile net income from operations to net cash used in operating activities
Non-cash operating lease cost	2,004	1,740
Depreciation and amortization	4,684	3,955
Loss on disposals of property, plant and equipment	(1)	(1)
Realized gain on short-term investments	(273)	(7,913)
Loss (income) from equity method investments	1,215	(3,888)
Unrealized loss on short-term investments	1,564	3,109
Inventory provision	3,009	3,224
Provision for credit losses	1,954	496
Deferred income taxes	(720)	(4,711)
Stock-based compensation	28,911	4,085
Dividends from unconsolidated affiliates	600	5,095
Net changes in operating assets and liabilities:
Accounts receivable	(14,842)	(28,630)
Other receivables	(11,686)	(8,252)
Inventories	(64,889)	(99,963)
Advances to related party (note 16)	(324)	2,167
Prepaid expenses	1,164	(4,749)
Related party accounts payable (note 16)	(6,605)	2,589
Accounts payable	2,400	9,963
Advances from customers	26,333	46,611
Deferred revenue	1,592	4,056
Income taxes payable	4,755	8,629
FIN-48 payable	(56)	(240)
Other payables and accrued expenses	6,824	10,004
Operating lease liabilities	(2,004)	(1,740)
Other long-term liabilities	(368)	(2,163)
Net cash provided by (used in) operating activities	51,942	(19,145)
Cash flows from investing activities:
Purchase of property and equipment	(38,512)	(21,633)
Purchase of intangible assets	(1,152)	(1,285)
Purchase of short-term investments (note 15)	(1,403)	0
Purchase of time deposits	(58,090)	(13,840)
Proceeds from maturity of time deposits	138,412	62,048
Proceeds from sale of short-term investments (note 15)	0	17,709
Purchase of long-term investments (note 14)	7,366	1,453
Net cash provided by investing activities	31,889	41,546
Cash flows from financing activities:
Proceeds from short-term borrowings	23,936	0
Repayments of short-term borrowings	(1,197)	0
Proceeds from long-term borrowings	32,277	0
Repayments of long-term borrowings	(3,202)	(1,111)
Proceeds from exercise of stock options	6,437	4,525
Net cash provided by financing activities	58,251	3,414
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(343)	(16,264)
Net increase in cash, cash equivalents and restricted cash	141,739	9,551
Cash, cash equivalents and restricted cash at beginning of period	183,173	248,451
Cash, cash equivalents and restricted cash at end of period	324,912	258,002
Supplemental disclosure of cash flow information:
Interest paid, net of capitalized interest	1,715	1,344
Cash paid for income taxes	9,109	7,243
Reconciliation of cash, cash equivalents and restricted cash in consolidated statements of cash flows:
Cash and cash equivalents	324,031	257,420
Restricted cash	881	582
Cash, cash equivalents and restricted cash	324,912	258,002
Other Noncash Investing and Financing Items [Abstract]
Cashless exercise of stock options	262	79
Proceeds from sale of short-term investments included in other receivables	3,167	0
Transfer from inventory to property, plant and equipment	0	4,557
Transfer of prepayment for property to property, plant, and equipment	$ 5,490	$ 177

SHORT-TERM BORROWINGS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
SHORT-TERM BORROWINGS (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Short-Term Borrowings [Abstract]
Short-term debt	$ 54,439		$ 54,439		$ 31,335
Interest expense related to short-term borrowings	425	$ 484	638	$ 974
Line of Credit up to RMB 150,000 from China Everbright Bank
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	150,000		$ 150,000		$ 150,000
Line of Credit, due on August 29, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	2,449		$ 2,449		$ 2,463
Line of Credit up to RMB 40,000 from Bank of China,
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	40,000		$ 40,000		$ 40,000
Line of Credit, due on September 7, 2024 with an annual interest rate of 2.87%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.87%		2.87%
Short-term debt	5,616		$ 5,616		$ 5,648
Line of Credit up to RMB 200,000 from China Merchants Bank
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	200,000		$ 200,000		$ 200,000
Line of Credit, China Merchants Bank, due on August 7, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 8, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 9, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 14, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 17, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 20, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 21, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 22, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 24, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 27, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 29, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on August 30, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on September 3, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,271
Line of Credit, China Merchants Bank, due on September 5, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,264		$ 1,264		$ 1,270
Line of Credit, China Merchants Bank, due on September 6, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,263		$ 1,263		$ 1,270
Line of Credit, China Merchants Bank, due on September 10, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,263		$ 1,263		$ 1,270
Line of Credit, China Merchants Bank, due on September 12, 2024 with an annual interest rate of 3.00%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			3.00%		3.00%
Short-term debt	1,263		$ 1,263		$ 1,270
Line Of Credit, China Merchants Bank, Due On February 27, 2025 With An Annual Interest Rate Of 2.60%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.60%		2.60%
Short-term debt	1,333		$ 1,333		$ 0
Line Of Credit, China Merchants Bank, Due On February 28, 2025 With An Annual Interest Rate Of 2.60%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.60%		2.60%
Short-term debt	1,333		$ 1,333		$ 0
Line Of Credit, China Merchants Bank, Due On March 1, 2025 With An Annual Interest Rate Of 2.60%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.60%		2.60%
Short-term debt	1,333		$ 1,333		$ 0
Line Of Credit, China Merchants Bank, Due On March 5, 2025 With An Annual Interest Rate Of 2.60%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.60%		2.60%
Short-term debt	1,333		$ 1,333		$ 0
Line Of Credit, China Merchants Bank, Due On March 8, 2025 With An Annual Interest Rate Of 2.60%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.60%		2.60%
Short-term debt	1,263		$ 1,263		$ 0
Line Of Credit Up To RMB 120,000 From Bank Of China
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	120,000		$ 120,000		$ 120,000
Line Of Credit, Bank Of China, Due On March 20, 2025 With An Annual Interest Rate Of 2.75%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			2.75%		2.75%
Short-term debt	16,848		$ 16,848		$ 0
Line Of Credit Up To KRW 500,000 from Industrial Bank Of Korea
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	500,000		$ 500,000		$ 500,000
Line Of Credit Due On July 12, 2024 With An Annual Interest Rate Of 6.03%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			6.03%		6.03%
Short-term debt	0		$ 0		$ 77
Line Of Credit Up To KRW 2,000,000 From Industrial Bank Of Korea
Short-Term Borrowings [Abstract]
Line of credit facility, maximum borrowing capacity	2,000,000		$ 2,000,000		$ 2,000,000
Line Of Credit Due On December 15, 2024 With An Annual Interest Rate Of 4.29%
Short-Term Borrowings [Abstract]
Line of credit facility, interest rate during period			4.27%		4.27%
Short-term debt	$ 1,446		$ 1,446		$ 1,544

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Disaggregated Revenue Information

The Company assesses revenues based upon the nature or type of goods or services it provides and the geographic location of the customer facility. The following tables present disaggregated revenue information:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	153,221	$	112,528	$	262,691	$	149,142
ECP (front-end and packaging), Furnace and Other Technologies	38,962		19,117		64,762		45,715
Advanced Packaging (excluding ECP), Services & Spares	10,297		12,932		27,218		23,976
Total Revenue by Product Category	$	202,480	$	144,577	$	354,671	$	218,833


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Mainland China	$	196,835	$	134,767	$	348,970	$	207,226
Other regions	5,645		9,810		5,701		11,607
	$	202,480	$	144,577	$	354,671	$	218,833

Accounts Receivables and Contract Liabilities

Below are the accounts receivables and contract liabilities balances as of:


	June 30, 2024	December 31, 2023
Accounts receivable	293,499	283,186
Advances from customers	205,609	181,368
Deferred revenue	5,279	3,687

Below are revenues recognized from amounts included in contract liabilities at the beginning of the year:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Revenue recognized from amounts included in contract liabilities at the beginning of the year	$	56,995	$	30,673	$	86,183	$	45,885

COMMITMENTS AND CONTINGENCIES	6 Months Ended
COMMITMENTS AND CONTINGENCIES	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company leases offices under non-cancelable operating lease agreements. See Note 11 for future minimum lease payments under non-cancelable operating lease agreements with initial terms of one year or more. As of June 30, 2024, the Company had $16,293 of open capital commitments to construction contracts and had additional $16,737 of capital investment commitments to Ninebell in April 2024; however, as of June 30, 2024, the investment still has not been approved by the People's Republic of China Business Bureau. As of December 31, 2023, the Company had $30,936 of open commitments to construction contracts and had additional $7,413 of capital investment commitments. Covenants in ACM Lingang’s Grant Contract for State-owned Construction Land Use Right in Shanghai City (Category of R&D Headquarters and Industrial Projects) with the China (Shanghai) Pilot Free Trade Zone Lingang Special Area Administration require, among other things, that ACM Lingang pay liquidated damages in the event that within 7 years after the land use right is obtained, or prior to July 9, 2027, the Company does not (i) generate a minimum specified amount of annual sales of products manufactured on the granted land or (ii) pay to mainland China at least RMB 157.6 million ($22,000) in annual total taxes (including value-added taxes, corporate income tax, personal income taxes, urban maintenance and construction taxes, education surcharges, stamp taxes, and vehicle and shipping taxes) as a result of operations in connection with the granted land. The Construction Completion Milestone was required to be met by January 9, 2024 but was not achieved. However, ACM Lingang believes it will receive the refund without penalty based on its explanation to the respective regulatory authorities and expects that it will meet the milestone in 2024. The Company cannot guarantee that ACM Lingang will achieve the missed milestone in 2024, or even if it does achieve the milestone in 2024, that it will be refunded some or all of the 20% portion of the performance deposit of RMB 2.5 million ($0.4 million). In the normal course of business, the Company is subject to contingencies, including legal proceedings and environmental claims arising out of the normal course of businesses that relate to a wide range of matters, including among others, contracts breach liability. The Company records accruals for such contingencies based upon the assessment of the probability of occurrence and, where determinable, an estimate of the liability. Management may consider many factors in making these assessments including past history, scientific evidence and the specifics of each matter. Some of these contingencies involve claims that are subject to substantial uncertainties and un-estimable damages. The Company’s management has evaluated all such proceedings and claims that existed as of June 30, 2024 and December 31, 2023. In the opinion of management, no provision for liability nor disclosure was required as of June 30, 2024 related to any claim against the Company because: (a) there is not a reasonable possibility that a loss exceeding amounts already recognized (if any) may be incurred with respect to such claim; (b) a reasonably possible loss or range of loss cannot be estimated; or (c) such estimate is immaterial. As of June 30, 2024, the Company had no outstanding legal proceedings.

RELATED PARTY BALANCES AND TRANSACTIONS

6 Months Ended

Jun. 30, 2024

RELATED PARTY BALANCES AND TRANSACTIONS

Ninebell

Ninebell is an equity investee of ACM (note 14) and is the Company’s principal supplier of robotic delivery system subassemblies used in our single-wafer cleaning equipment. The Company purchases equipment from Ninebell for production in the ordinary course of business. The Company pays for a portion of the equipment in advance and is obligated for the remaining amounts upon receipt of the product.

Shengyi

Shengyi is an equity investee of ACM Shanghai (note 14) and is one of the Company’s component suppliers in mainland China. The Company purchases components from Shengyi for production in the ordinary course of business. The Company incurs a service fee related to installation and hook-up fees which is recorded within cost of revenue on the Company’s condensed consolidated statements of comprehensive income (loss). The Company pays for a portion of the raw materials in advance and is obligated for the remaining amounts upon receipt of the product.

All related party outstanding balances are short-term in nature and are expected to be settled in cash.

The following tables reflect related party transactions in our condensed consolidated financial statements:


Advances to related party	June 30, 2024		December 31, 2023
Ninebell	$	2,756	$	2,432


Accounts payable	June 30, 2024		December 31, 2023
Ninebell	$	12,247	$	7,624
Shengyi	5,765		3,783
Total	$	18,012	$	11,407


	Three Months Ended June 30,				Six Months Ended June 30,
Purchase of materials	2024		2023		2024		2023
Ninebell	$	13,778	$	10,604	$	27,930	$	27,001
Shengyi	2,349		706		3,341		2,679
Total	$	16,127	$	11,310	$	31,271	$	29,680


	Three Months Ended June 30,				Six Months Ended June 30,
Service fee charged by	2024		2023		2024		2023
Shengyi	$	154	$	452	$	227	$	730

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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+ Details

ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	6 Months Ended
ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts Receivable [Abstract]
Accounts receivable	$ 300,283	$ 288,016
Less: Allowance for credit losses	(6,784)	(4,830)
Total accounts receivable, net	293,499	$ 283,186
Accounts receivable [Abstract]
Increase accounts receivable	10,300
Increase in revenue	$ 135,800

OTHER LONG-TERM LIABILITIES

6 Months Ended

Jun. 30, 2024

Other Liabilities Disclosure [Abstract]

OTHER LONG-TERM LIABILITIES

Other long-term liabilities represent government subsidies received from mainland China governmental authorities for development and commercialization of certain technology but not yet recognized. At June 30, 2024 and December 31, 2023, other long-term liabilities consisted of the following unearned government subsidies:


	June 30, 2024		December 31, 2023
Subsidies commenced in 2020 and prior	$	769	$	1,107
Subsidies to SW Lingang R&D development commenced in 2021	3,433		3,467
Other	1,303		1,299
Total	$	5,505	$	5,873

INVENTORIES

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

INVENTORIES

At June 30, 2024 and December 31, 2023, inventories consisted of the following:


	June 30, 2024		December 31, 2023
Raw materials	$	248,443	$	235,062
Work-in-process	75,569		81,438
Finished goods	278,915		228,895
Total inventory, net	$	602,927	$	545,395

At June 30, 2024 and December 31, 2023, the value of finished goods inventory of which were first-tools at customer physical locations for which customers were contractually obligated to take ownership upon acceptance totaled $167,356 and $123,390, respectively.

The $13,381 increase in raw materials at June 30, 2024 compared to December 31, 2023 was due to additional purchase of supplies to support a higher level of expected total shipments for the next several quarters, and to reduce the risk of supply chain delays to meet anticipated customer demand for the Company’s products.

The $50,020 increase in finished goods inventory at June 30, 2024 compared to December 31, 2023 primarily reflects a higher value of first-tools under evaluation by existing or prospective customers, due to shipments made, net of customer acceptances during the period.

The Company’s products each require a certain degree of customization, and the substantial majority of the work-in-process inventory and finished goods inventory is built to meet a specific customer order for a repeat shipment or a first tool shipment. At the end of each period, the Company assesses the status of each item in work-in-process and finished goods inventory. The Company recognizes a loss or impairment if in management’s judgement the inventory cannot be sold or used for production, if it has been damaged or should be considered as obsolete, or if the net realizable value is lower than the cost.

At the end of each period, the Company also assesses the status of its raw materials. The Company recognizes a loss or impairment for any raw materials aged more than three years. The three-year aging is based on the Company’s assessment of technology change, its requirement to maintain stock for warranty coverage, and other factors.

During the three months ended June 30, 2024 and 2023, provision for inventory of $1,984 and $2,919 were recognized in cost of revenue, respectively. During the six months ended June 30, 2024 and 2023, provision for inventory of $3,009 and $3,224 were recognized in cost of revenue, respectively. Write-downs were due to an internal assessment that certain inventory could not be sold or used for production due to damage or obsolescence.

LEASES - Weighted Average Remaining Lease Term (Details)	Jun. 30, 2024	Dec. 31, 2023
Lessee, Operating Lease, Description [Abstract]
Weighted average remaining lease term (years)	3 years 3 months 14 days	3 years 5 months 8 days
Weighted average discount rate	3.84%	3.91%

LONG-TERM INVESTMENTS - Summary of Long Term Investments (Details) ¥ in Thousands, $ in Thousands	Jun. 30, 2024 USD ($)	Jun. 30, 2024 CNY (¥)	Jan. 19, 2024 USD ($)	Jan. 19, 2024 CNY (¥)	Jan. 12, 2024 USD ($)	Jan. 12, 2024 CNY (¥)	Dec. 31, 2023 USD ($)
Long-Term Investments [Line Items]
Total	$ 31,898						$ 27,880
Equity investee:
Long-Term Investments [Line Items]
Total	19,833						17,502
Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	31,898						27,880
Ninebell \| Equity investee:
Long-Term Investments [Line Items]
Total	$ 5,923						5,632
Ninebell \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	20.00%	20.00%
Investment purchase price	$ 1,200
Wooil \| Equity investee:
Long-Term Investments [Line Items]
Total	$ 975						1,003
Wooil \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	20.00%	20.00%
Investment purchase price	$ 1,000
Hefei Shixi \| Equity investee:
Long-Term Investments [Line Items]
Total	$ 6,469						9,174
Hefei Shixi \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	10.00%	10.00%
Investment purchase price	$ 4,200	¥ 30,000
Shengyi \| Equity investee:
Long-Term Investments [Line Items]
Total	2,257						1,693
Shengyi \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 852						857
Shengyi \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	14.00%	14.00%
Investment purchase price	$ 109
Company D \| Equity investee:
Long-Term Investments [Line Items]
Total	$ 4,209						0
Company D \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	16.70%	16.70%	16.70%	16.70%
Investment purchase price	$ 4,230	¥ 30,000	$ 4,230	¥ 30,000
Waferworks \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 0						1,412
Waferworks \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	0.30%	0.30%
Investment purchase price	$ 1,568
Shengyi \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	1.00%	1.00%
Investment purchase price	$ 860	¥ 6,100
Company A \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 4,209						4,236
Company A \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	4.40%	4.40%
Investment purchase price	$ 4,200	¥ 30,000
Company B \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 926						932
Company B \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	1.40%	1.40%
Investment purchase price	$ 930	¥ 6,600
Company C \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	1,754						0
Company C \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries					5.00%	5.00%
Investment purchase price	1,760	¥ 12,500			$ 1,760	¥ 12,500
Company E \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 1,403						0
Company E \| Common Stock Class A
Long-Term Investments [Line Items]
Percent ownership by ACM and subsidiaries	0.60%	0.60%
Investment purchase price	$ 1,403	¥ 10,000	$ 1,403	¥ 10,000
Other \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	2,921						2,941
Subtotal measurement alternative \| Investments accounted for using measurement alternative:
Long-Term Investments [Line Items]
Total	$ 12,065						$ 10,378

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2024

Segment Reporting [Abstract]

SEGMENT INFORMATION

The Company identifies operating segments according to how the business activities are managed and evaluated. The Company’s chief operating decision maker (“CODM”) has been identified as ACM’s Chief Executive Officer. The Company's operating segments include ACM Research and ACM Shanghai. As the Company is engaged in the developing, manufacture and sale of capital equipment to global semiconductor manufacturers, and each of the operating segments share similar economic and other qualitative characteristics, the results of the Company’s operating segments are aggregated into one reportable segment.

For geographical reporting, revenue by geographic location is determined by the location of customers’ facilities to which products were shipped. Long-lived assets consist primarily of property, plant and equipment, land use right, and right-of-use assets and are attributed to the geographic location in which they are located.

Long-lived assets by geographic region as of the periods ended were as follows:


	June 30, 2024		December 31, 2023
Long-lived assets by geography:
Mainland China	$	241,246	$	209,725
Korea	11,631		12,190
United States	1,248		1,276
Total	$	254,125	$	223,191

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

STATUTORY SURPLUS RESERVE	6 Months Ended
STATUTORY SURPLUS RESERVE	Jun. 30, 2024
STATUTORY SURPLUS RESERVE [Abstract]
STATUTORY SURPLUS RESERVE	STATUTORY SURPLUS RESERVE In accordance with mainland China’s Foreign Enterprise Law, ACM Shanghai, ACM Lingang, and ACM Wuxi are required to make appropriation to reserve funds, comprising the statutory surplus reserve and discretionary surplus reserve, based on after-tax net income in accordance with generally accepted accounting principles of mainland China (“mainland China GAAP”). Appropriations to the statutory surplus reserve are required to be at least 10% of the after-tax net income determined in accordance with mainland China GAAP until the reserve is equal to 50% of the entities’ registered capital. The amount is calculated annually at the end of each calendar year. The balances of statutory reserve funds was $30,060 as of both June 30, 2024 and December 31, 2023, and is presented as statutory surplus reserve on the Company’s condensed consolidated balance sheets.

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregated Revenue Information [Abstract]
Revenues	$ 202,480	$ 144,577	$ 354,671	$ 218,833
Mainland China
Disaggregated Revenue Information [Abstract]
Revenues	196,835	134,767	348,970	207,226
Other regions
Disaggregated Revenue Information [Abstract]
Revenues	5,645	9,810	5,701	11,607
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment
Disaggregated Revenue Information [Abstract]
Revenues	153,221	112,528	262,691	149,142
ECP (front-end and packaging), Furnace and Other Technologies
Disaggregated Revenue Information [Abstract]
Revenues	38,962	19,117	64,762	45,715
Advanced Packaging (excluding ECP), Services & Spares
Disaggregated Revenue Information [Abstract]
Revenues	$ 10,297	$ 12,932	$ 27,218	$ 23,976

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Topic 280
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue (note 3)	$ 202,480	$ 144,577	$ 354,671	$ 218,833
Cost of revenue, including cost of revenue from related parties of $16.1 million and $31.3 million for the three and six months ended June 30, 2024, respectively and $11.3 and $29.7 million for the three and six months ended June 30, 2023, respectively (note 16)	105,696	75,938	178,766	110,208
Gross profit	96,784	68,639	175,905	108,625
Operating expenses:
Sales and marketing	17,135	11,439	31,308	20,776
Research and development	25,968	20,064	49,886	34,093
General and administrative	16,088	6,706	31,886	14,464
Total operating expenses	59,191	38,209	113,080	69,333
Income from operations	37,593	30,430	62,825	39,292
Interest income	2,381	2,346	4,155	4,131
Interest expense	(932)	(649)	(1,715)	(1,344)
Realized gain from sale of short-term investments (note 15)	0	3,919	273	7,913
Unrealized gain (loss) on short-term investments (note 15)	1,031	(2,455)	(1,564)	(3,109)
Other income, net	1,357	3,724	4,437	2,306
Income (loss) from equity method investments (note 15)	(695)	3,920	(1,215)	3,888
Income before income taxes	40,735	41,235	67,196	53,077
Income tax expense (note 19)	(9,336)	(7,638)	(13,705)	(10,517)
Net income	31,399	33,597	53,491	42,560
Less: Net income attributable to non-controlling interests	7,189	6,772	11,848	8,590
Net income attributable to ACM Research, Inc.	24,210	26,825	41,643	33,970
Comprehensive income (loss):
Net income	31,399	33,597	53,491	42,560
Foreign currency translation adjustment, net of tax	116	(35,269)	(6,713)	(25,846)
Comprehensive income (loss)	31,515	(1,672)	46,778	16,714
Less: Comprehensive income attributable to non-controlling interests	7,210	652	10,616	4,114
Comprehensive income (loss) attributable to ACM Research, Inc.	$ 24,305	$ (2,324)	$ 36,162	$ 12,600
Net income attributable to ACM Research, Inc. per share of common stock (note 2):
Basic (in dollars per share)	$ 0.39	$ 0.45	$ 0.67	$ 0.57
Diluted (in dollars per share)	$ 0.35	$ 0.41	$ 0.61	$ 0.52
Weighted average shares of common stock outstanding used in computing per share amounts (note 2):
Basic (in shares)	62,178,369	59,898,149	61,772,776	59,817,903
Diluted (in shares)	67,057,846	64,929,638	66,520,706	64,968,900

SHORT-TERM BORROWINGS (Tables)

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Short-Term Borrowings

At June 30, 2024 and December 31, 2023, short-term borrowings consisted of the following:


	June 30, 2024		December 31, 2023
Line of credit up to RMB 150,000 from China Everbright Bank,
1)due on August 29, 2024 with an annual interest rate of 3.00%.	2,449		2,463
Line of credit up to RMB 40,000 from Bank of China,
1)due on September 7, 2024 with an annual interest rate of 2.87%.	5,616		5,648
Line of credit up to RMB 200,000 from China Merchants Bank,
1)due on August 7, 2024 with an annual interest rate of 3.00%.	1,264		1,271
2)due on August 8, 2024 with an annual interest rate of 3.00%.	1,264		1,271
3)due on August 9, 2024 with an annual interest rate of 3.00%.	1,264		1,271
4)due on August 14, 2024 with an annual interest rate of 3.00%.	1,264		1,271
5)due on August 17, 2024 with an annual interest rate of 3.00%.	1,264		1,271
6)due on August 20, 2024 with an annual interest rate of 3.00%.	1,264		1,271
7)due on August 21, 2024 with an annual interest rate of 3.00%.	1,264		1,271
8)due on August 22, 2024 with an annual interest rate of 3.00%.	1,264		1,271
9)due on August 24, 2024 with an annual interest rate of 3.00%.	1,264		1,271
10)due on August 27, 2024 with an annual interest rate of 3.00%.	1,264		1,271
11)due on August 29, 2024 with an annual interest rate of 3.00%.	1,264		1,271
12)due on August 30, 2024 with an annual interest rate of 3.00%.	1,264		1,271
13)due on September 3, 2024 with an annual interest rate of 3.00%.	1,264		1,271
14)due on September 5, 2024 with an annual interest rate of 3.00%.	1,264		1,270
15)due on September 6, 2024 with an annual interest rate of 3.00%.	1,263		1,270
16)due on September 10, 2024 with an annual interest rate of 3.00%.	1,263		1,270
17)due on September 12, 2024 with an annual interest rate of 3.00%.	1,263		1,270
18)due on February 27, 2025 with an annual interest rate of 2.60%.	1,333		—
19)due on February 28, 2025 with an annual interest rate of 2.60%.	1,333		—
20)due on March 1, 2025 with an annual interest rate of 2.60%.	1,333		—
21)due on March 5, 2025 with an annual interest rate of 2.60%.	1,333		—
22)due on March 8, 2025 with an annual interest rate of 2.60%.	1,263		—
Line of credit up to RMB 120,000 from Bank of China,
1)due on March 20, 2025 with an annual interest rate of 2.75%.	16,848		—
Line of credit up to KRW 500,000 from Industrial Bank of Korea,
1)due on July 12, 2024 with an annual interest rate of 6.03%.	—		77
Line of credit up to KRW 2,000,000 from Industrial Bank of Korea,
1)due on December 15, 2024 with an annual interest rate of 4.27%.	1,446		1,544
Total	$	54,439	$	31,335

SHORT-TERM INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Components of Trading Securities

At June 30, 2024 and December 31, 2023, the components of short-term investments were as follows:


	June 30, 2024		December 31, 2023
Short-term investments listed in Shanghai Stock Exchange
Cost	$	21,045	$	20,155
Market value	19,597		21,312

Unrealized Gain (Loss) on Trading Securities

For the three and six months ended June 30, 2024 and 2023, the net gains (losses) recognized on equity securities were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Unrealized gain (loss) recognized during the reporting period on short-term investment still held at June 30	$	1,031	$	(2,455)	$	(1,564)	$	(3,109)
Net gain recognized during the period on short-term sold during the period	$	—	$	3,919	$	273	$	7,913
Total net gain (loss) recognized at June 30 on short-term investment	$	1,031	$	1,464	$	(1,291)	$	4,804

Insider Trading Arrangements	3 Months Ended	6 Months Ended
Insider Trading Arrangements	Jun. 30, 2024 shares	Jun. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
David Wang [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On May 14, 2024, David Wang, President, Chief Executive Officer and a member of the Board of Directors of ACM Research, adopted a Rule 10b5-1 trading arrangement (the “Wang Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Wang Plan allows for the contemporaneous exercise of options and sale of up to 480,000 shares of Class A Common Stock, at specific market prices, commencing on August 22, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) April 30, 2025, or (iii) such date that the Wang Plan is otherwise terminated according to its terms, whichever comes first.
Name	David Wang
Title	President, Chief Executive Officer and a member of the Board of Directors of ACM Research
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 14, 2024
Expiration Date	April 30, 2025
Arrangement Duration	351 days
Aggregate Available	480,000	480,000
Tracy Liu [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On May 17, 2024, Tracy Liu, a member of the Board of Directors of ACM Research, adopted a Rule 10b5-1 trading arrangement (the “Liu Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Liu Plan allows for the contemporaneous exercise of options and sale of up to 19,500 shares of Class A Common Stock, at specific market prices, commencing on August 16, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) May 19, 2025, or (iii) such date that the Liu Plan is otherwise terminated according to its terms, whichever comes first.
Name	Tracy Liu
Title	member of the Board of Directors of ACM Research
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 17, 2024
Expiration Date	May 19, 2025
Arrangement Duration	367 days
Aggregate Available	19,500	19,500
Fuping Chen [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On May 31, 2024, Fuping Chen, Vice President, Sales—China of ACM Shanghai, adopted a Rule 10b5-1 trading arrangement (the “Chen Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Chen Plan allows for the contemporaneous exercise of options and sale of up to 100,000 shares of Class A Common Stock, at specific market prices, commencing on August 30, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) May 30, 2025, or (iii) such date that the Chen Plan is otherwise terminated according to its terms, whichever comes first.
Name	Fuping Chen
Title	Vice President, Sales—China of ACM Shanghai
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 31, 2024
Expiration Date	May 30, 2025
Arrangement Duration	364 days
Aggregate Available	100,000	100,000
Shanghai Science and Technology Venture Capital Co. Ltd [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On June 12, 2024, Shanghai Science and Technology Venture Capital Co., Ltd. ("SSTVC"), adopted a Rule 10b5-1 trading arrangement (the “SSTVC Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The SSTVC Plan allows for the sale of up to 1.1 million shares of Class A Common Stock, at specific market prices, commencing on September 10, 2024, and continuing until (i) all such shares are sold, (ii) December 31, 2024, or (iii) such date that the SSTVC Plan is otherwise terminated according to its terms, whichever comes first. Xia Xing, a member of the Board of Directors of ACM Research, is an employee of an affiliate of SSTVC.
Name	Shanghai Science and Technology Venture Capital Co., Ltd. ("SSTVC")
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 12, 2024
Expiration Date	December 31, 2024
Arrangement Duration	202 days
Aggregate Available	1,100,000	1,100,000

ACCOUNTS RECEIVABLE (Tables)

6 Months Ended

Jun. 30, 2024

Receivables [Abstract]

Accounts Receivable

At June 30, 2024 and December 31, 2023, accounts receivable consisted of the following:


	June 30, 2024		December 31, 2023
Accounts receivable	$	300,283	$	288,016
Less: Allowance for credit losses	(6,784)		(4,830)
Total accounts receivable, net	$	293,499	$	283,186

The movement of the allowance for credit losses for the six months ended June 30, 2024 is as follows:



Allowance for credit losses, before tax, as of December 31, 2023
Provision for credit losses
Allowance for credit losses, before tax, as of June 30, 2024


June 30, 2024
$	(4,830)
(1,954)
$	(6,784)

SHORT-TERM INVESTMENTS - Narrative (Details) ¥ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 CNY (¥)	Feb. 29, 2024 USD ($)	Feb. 29, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Dec. 31, 2022	Sep. 27, 2022 USD ($)	Sep. 27, 2022 CNY (¥)	Sep. 19, 2022 USD ($)	Sep. 19, 2022 CNY (¥)
Investments [Abstract]
Proceeds from sale of short-term investments			$ 0	$ 17,709
Proceeds from the sale of short-term investments, including a realized gain	$ 0	$ 3,919	273	7,913
Nuode Asset Management Company Limited
Investments [Abstract]
Investment in partnership													$ 4,196	¥ 30,000	$ 22,160	¥ 160,000
Ownership percentage in partnership												18.75%	18.75%	18.75%
Sale of short-term investments receivable	3,167		3,167		¥ 22,478
Huahong Semiconductor Limited
Investments [Abstract]
Investment in partnership										$ 13,930	¥ 100,000
Zhongiuxin Limited Company
Investments [Abstract]
Investment in partnership								$ 4,179	¥ 30,000
Shanghai Syncrystalline Silicon Materials Co., Ltd
Investments [Abstract]
Investment in partnership	$ 2,818		$ 2,818		¥ 20,000	$ 1,409	¥ 10,000
SMIC
Investments [Abstract]
Proceeds from sale of short-term investments		6,637		17,709
Proceeds from the sale of short-term investments, including a realized gain		$ 3,919		$ 7,913

REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Advances from customers			$ 26,333	$ 46,611
Revenue recognized from amounts included in contract liabilities at the beginning of the year	$ 56,995	$ 30,673	86,183	$ 45,885
First-Tools
Disaggregation of Revenue [Line Items]
Advances from customers			$ 24,200

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

REVENUE FROM CONTRACTS WITH CUSTOMERS


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	153,221	$	112,528	$	262,691	$	149,142
ECP (front-end and packaging), Furnace and Other Technologies	38,962		19,117		64,762		45,715
Advanced Packaging (excluding ECP), Services & Spares	10,297		12,932		27,218		23,976
Total Revenue by Product Category	$	202,480	$	144,577	$	354,671	$	218,833


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Mainland China	$	196,835	$	134,767	$	348,970	$	207,226
Other regions	5,645		9,810		5,701		11,607
	$	202,480	$	144,577	$	354,671	$	218,833

Below are the accounts receivables and contract liabilities balances as of:


	June 30, 2024	December 31, 2023
Accounts receivable	293,499	283,186
Advances from customers	205,609	181,368
Deferred revenue	5,279	3,687

During the six months ended June 30, 2024, advances from customers increased by $24.2 million, due to an increase of payments made by customers for first tools under evaluation, offset by a decrease in customer pre-payments for tools prior to delivery.

Below are revenues recognized from amounts included in contract liabilities at the beginning of the year:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Revenue recognized from amounts included in contract liabilities at the beginning of the year	$	56,995	$	30,673	$	86,183	$	45,885

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

INCOME TAXES (Tables)

6 Months Ended

Jun. 30, 2024

Income Tax Disclosure [Abstract]

Income Tax Benefit (Expense)

Income tax expense was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Total income tax expense	$	(9,336)	$	(7,638)	$	(13,705)	$	(10,517)

LONG-TERM INVESTMENTS

6 Months Ended

Jun. 30, 2024

Long-Term Investments [Abstract]

LONG-TERM INVESTMENTS

On January 12, 2024, ACM Shanghai entered into an investment agreement with Company C to invest RMB 12,500 ($1,760), which represented 5.0% of the Company C's total equity interest. Since there is no readily determinable fair value, the Company measures the investments at measurement alternative.

On January 19, 2024, ACM Shanghai entered into a limited partnership agreement with Company D to invest RMB 30,000 ($4,230), which represented 16.7% of the partnership's total equity interest. The investment in the limited partnership with Company D is accounted for under the equity method in accordance with ASC323-30-S99-1.

On January 22, 2024, ACM Shanghai entered into an investment agreement with Company E to invest RMB 10,000 ($1,403) which represented 0.6% of the Company E's total equity interest. The transaction was closed in April 2024. Since there is no readily determinable fair value, the Company measures the investments at measurement alternative.

Equity investee:

Initial investment dates

Investment entity

Percent ownership by ACM and subsidiaries

Investment purchase price

Ninebell Co., Ltd. ("Ninebell")

September 2017

ACM

20.0%

1,200

Wooil Flucon Co. ("Wooil")

August 2022

ACM Singapore

20.0%

1,000

Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital FundPartnership (LP) (“Hefei Shixi”)

September 2019

ACM Shanghai

10.0%

RMB 30,000 ($4,200)

Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")

June 2019

ACM Shanghai

14.0%

109

Company D

February 2024

ACM Shanghai

16.7%

RMB 30,000 ($4,230)

Investments accounted for using measurement alternative:

Waferworks (Shanghai) Co., Ltd. (“Waferworks”)

October 2021

ACM Shanghai

0.3%

1,568

Shengyi

September 2023

ACM Shanghai

1.0%

RMB 6,100 ($860)

Company A

September 2023

ACM Shanghai

4.4%

RMB 30,000 ($4,200)

Company B

November 2023

ACM Shanghai

1.4%

RMB 6,600 ($930)

Company C

February 2024

ACM Shanghai

5.0%

RMB 12,500 ($1,760)

Company E

April 2024

ACM Shanghai

0.6%

RMB 10,000 ($1,403)


Equity investee:	June 30, 2024		December 31, 2023
Ninebell	$	5,923	$	5,632
Wooil	975		1,003
Shengyi	2,257		1,693
Hefei Shixi	6,469		9,174
Company D	4,209		—
Subtotal	19,833		17,502
Investments accounted for using measurement alternative:
Waferworks	—		1,412
Shengyi	852		857
Company A	4,209		4,236
Company B	926		932
Company C	1,754		—
Company E	1,403		—
Other	2,921		2,941
Subtotal measurement alternative	12,065		10,378
Total	31,898		27,880

For the three months ended June 30, 2024 and 2023, the Company’s share of equity investees’ net income (loss) was $(695) and $3,920, respectively, and $(1,215) and $3,888 for the six months ended June 30, 2024 and 2023, respectively, which amounts were included in loss from equity method investments in the accompanying condensed consolidated statements of comprehensive income (loss). For the three months ended June 30, 2024 and 2023, the Company received $0 and $5,095 dividends from equity investee. For the six months ended June 30, 2024 and 2023, the Company received $600 and $5,095 dividends from equity investee.

SHORT-TERM INVESTMENTS

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM INVESTMENTS

Pursuant to an Agreement entered into on September 19, 2022 (the ‘‘Agreement’’), ACM Shanghai became a limited partner of the Nuode Asset Fund Pujiang No. 783 Single Asset Management Plan (‘‘Nuode Asset Fund’’), a Chinese limited partnership formed by Nuode Asset Management Co., Ltd, a financial services firm based in Shanghai, China. Nuode Asset Fund was formed to establish a special fund with the purpose to participate in certain technology related investments in mainland China. Subsequent to the future purchase, any investment will be held by Nuode Asset Fund and restricted for a minimum period of nine months. The limited partners of the Nuode Asset Fund contributed a total RMB 160 million ($22,160) to the fund, of which ACM Shanghai contributed RMB 30 million ($4,196), or 18.75% of the contribution on September 27, 2022.

In December 2022, the Nuode Asset Fund purchased shares in the secondary stock offering of a publicly traded mainland China-stock listing. The number of shares owned by Nuode Asset Fund was apportioned to all of the limited partners in proportion to their respective capital contributions which is 18.75% in the case of ACM Shanghai. The investments were fully disposed during the six months ended June 30, 2024. The Company has not received the proceeds and a receivable of RMB 22,478 ($3,167) was recorded as of June 30, 2024.

Pursuant to a Share Purchase Agreement dated June 2023, ACM Shanghai acquired shares of Huahong Semiconductor Limited (“Huahong”) in July 2023 with amount of RMB 100 million ($13,930). The shares held by ACM Shanghai are restricted for sale for a minimum period of twelve months. Huahong completed its STAR IPO in August 2023.

Pursuant to a Share Purchase Agreement dated August 2023, ACM Shanghai acquired shares of Zhongjuxin Limited Company (“Zhongjuxin”) in September 2023 with amount of RMB 30 million ($4,179). The shares held by ACM Shanghai are restricted for sale for a minimum period of twelve months. Zhongjuxin completed its STAR IPO in September 2023.

Pursuant to a Share Purchase Agreement dated January 2024, ACM Shanghai acquired shares of Shanghai Syncrystalline Silicon Materials Co., Ltd. (“Syncrystalline”) in February 2024 with amount of RMB 10 million ($1,409). The shares held by ACM Shanghai are restricted for sale for a minimum period of twelve months. Syncrystalline completed its STAR IPO in February 2024. As of June 30, 2024, the Company's total investment costs in Syncrystalline were RMB 20,000 ($2,818), including RMB 10 million ($1,409) invested by ACM Shanghai in 2021 and RMB 10 million ($1,409) invested by ACM Shanghai in February 2024.

At June 30, 2024 and December 31, 2023, the components of short-term investments were as follows:


	June 30, 2024		December 31, 2023
Short-term investments listed in Shanghai Stock Exchange
Cost	$	21,045	$	20,155
Market value	19,597		21,312

For the three and six months ended June 30, 2024 and 2023, the net gains (losses) recognized on equity securities were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Unrealized gain (loss) recognized during the reporting period on short-term investment still held at June 30	$	1,031	$	(2,455)	$	(1,564)	$	(3,109)
Net gain recognized during the period on short-term sold during the period	$	—	$	3,919	$	273	$	7,913
Total net gain (loss) recognized at June 30 on short-term investment	$	1,031	$	1,464	$	(1,291)	$	4,804

For the three and six months ended June 30, 2024, the Company did not receive proceeds from the sale of short-term investments.

For the three and six months ended June 30, 2023, the Company recognized $6,637 and $17,709 in proceeds from the sale of short-term investments, including a realized gain of $3,919 and $7,913.

INCOME TAXES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		36 Months Ended
INCOME TAXES - Narrative (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) subsidiary	Jun. 30, 2023 USD ($)	Dec. 31, 2022	Dec. 31, 2023 USD ($)
Income Taxes [Abstract]
Income tax expense	$ 9,336	$ 7,638	$ 13,705	$ 10,517
Capitalized contract cost, amortization period	15 years		15 years
Unrecognized tax benefits	$ 13,026		$ 13,026			$ 13,026
Unrecognized tax benefits that would impact effective tax rate	$ 12,943		12,943			$ 12,943
Interest or penalties			$ 677	$ 569
Number of subsidiaries \| subsidiary			4
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Income Taxes [Abstract]
Foreign corporate tax rate			15.00%
Foreign Tax Authority
Income Taxes [Abstract]
Foreign corporate tax rate			25.00%
Effective period of preferential income tax rate			3 years
Foreign Tax Authority \| Minimum
Income Taxes [Abstract]
Foreign corporate tax rate			15.00%
Foreign Tax Authority \| Maximum
Income Taxes [Abstract]
Foreign corporate tax rate			25.00%
Foreign Tax Authority \| ACM Research (Shanghai), Inc. ("ACM Shanghai")
Income Taxes [Abstract]
Foreign corporate tax rate					12.50%
Foreign Tax Authority \| ACM Research (Shanghai), Inc. ("ACM Shanghai") \| Minimum
Income Taxes [Abstract]
Foreign corporate tax rate			15.00%
Foreign Tax Authority \| ACM Research (Wuxi), Inc. ("ACM Wuxi")
Income Taxes [Abstract]
Foreign corporate tax rate			25.00%
Foreign Tax Authority \| ACM Research (Beijing), Inc. ("ACM Beijing")
Income Taxes [Abstract]
Foreign corporate tax rate			25.00%
Foreign Tax Authority \| ACM Research (Lingang), Inc. ("ACM Lingang")
Income Taxes [Abstract]
Foreign corporate tax rate			15.00%

LAND USE RIGHT, NET - Summary of Land Use Right (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Land Use Right, Net [Abstract]
Land use right purchase amount	$ 8,939	$ 8,996
Less: accumulated amortization	(714)	(629)
Land use right, net	$ 8,225	$ 8,367

OTHER PAYABLES AND ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

OTHER PAYABLES AND ACCRUED EXPENSES

At June 30, 2024 and December 31, 2023, other payables and accrued expenses consisted of the following:


	June 30, 2024		December 31, 2023
Accrued commissions	$	17,814	$	15,572
Accrued warranty	11,273		9,834
Accrued payroll	13,062		14,840
Accrued professional fees	713		696
Accrued machine testing fees	1,581		1,762
Accrued machine sales fees	6,411		6,010
Accrued Lingang construction fees	33,447		33,729
Others	30,639		20,508
Total	$	114,940	$	102,951

Warranties

The Company provides standard warranties on its products. The liability amount is based on actual historical warranty spending activity by type of product, customer, and geographic region, modified for any known differences such as the impact of product reliability improvements.

Changes in the Company’s accrued warranty were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Balance at beginning of period	$	11,339	$	9,240	$	9,834	$	8,780
Additions	2,802		1,682		$	5,098	$	2,510
Utilized	(2,868)		(1,743)		$	(3,659)	$	(2,111)
Balance at end of period	$	11,273	$	9,179	$	11,273	$	9,179

INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
INVENTORIES (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Inventory, Net [Abstract]
Raw materials	$ 248,443		$ 248,443		$ 235,062
Work-in-process	75,569		75,569		81,438
Finished goods	278,915		278,915		228,895
Total inventory, net	602,927		602,927		545,395
Increase in raw materials and work in process			13,381
Increase in finished goods			$ 50,020
Inventory impairment, period			3 years
Inventory write-down	1,984	$ 2,919	$ 3,009	$ 3,224
First-tools, Customer Ownership
Inventory, Net [Abstract]
Finished goods	$ 167,356		$ 167,356		$ 123,390

OTHER LONG-TERM ASSETS - Summary of Other Long-term Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Assets, Noncurrent Disclosure [Abstract]
Prepayments for property, plant and equipment	$ 7,988	$ 3,380
Lease deposits	884	834
Security deposit for land use right	692	696
Others	1,353	1,140
Total other long-term assets	$ 10,917	$ 6,050

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock Class A	Common Stock Class B	Common Stock Common Stock Class A	Common Stock Common Stock Class B	Additional Paid- in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Statutory Surplus Reserve	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2022					54,655,286	5,021,811
Beginning balance at Dec. 31, 2022	$ 812,171	$ (1,769)			$ 5	$ 1	$ 604,089	$ 94,426	$ (1,769)	$ 16,881	$ (40,546)	$ 137,315
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,560							33,970				8,590
Foreign currency translation adjustment	(25,846)										(21,370)	(4,476)
Exercise of stock options (in shares)					296,204
Exercise of stock options	4,525						691					3,834
Stock-based compensation	4,085						4,085
Shanghai dividend	(3,951)											(3,951)
Ending balance (in shares) at Jun. 30, 2023					54,951,490	5,021,811
Ending balance at Jun. 30, 2023	831,775				$ 5	$ 1	608,865	126,627		16,881	(61,916)	141,312
Beginning balance (in shares) at Mar. 31, 2023					54,818,355	5,021,811
Beginning balance at Mar. 31, 2023	831,097				$ 5	$ 1	606,398	99,802		16,881	(32,768)	140,778
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,597							26,825				6,772
Foreign currency translation adjustment	(35,269)										(29,148)	(6,121)
Exercise of stock options (in shares)			133,135		133,135
Exercise of stock options	4,284						450					3,834
Stock-based compensation	2,017						2,017
Shanghai dividend	(3,951)											(3,951)
Ending balance (in shares) at Jun. 30, 2023					54,951,490	5,021,811
Ending balance at Jun. 30, 2023	831,775				$ 5	$ 1	608,865	126,627		16,881	(61,916)	141,312
Beginning balance (in shares) at Dec. 31, 2023			56,036,172	5,021,811	56,036,172	5,021,811
Beginning balance at Dec. 31, 2023	926,162				$ 6	$ 1	629,845	156,827		30,060	(49,349)	158,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,491							41,643				11,848
Foreign currency translation adjustment	(6,713)										(5,481)	(1,232)
Exercise of stock options (in shares)			1,366,081		1,366,081
Exercise of stock options	6,437						5,645					792
Stock-based compensation	28,911						23,972					4,939
Shanghai dividend	(6,900)											(6,900)
Ending balance (in shares) at Jun. 30, 2024			57,402,253	5,021,811	57,402,253	5,021,811
Ending balance at Jun. 30, 2024	1,001,388				$ 6	$ 1	659,462	198,470		30,060	(54,830)	168,219
Beginning balance (in shares) at Mar. 31, 2024					56,986,777	5,021,811
Beginning balance at Mar. 31, 2024	960,793				$ 6	$ 1	646,800	174,260		30,060	(54,925)	164,591
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,399							24,210				7,189
Foreign currency translation adjustment	116										95	21
Exercise of stock options (in shares)					415,476
Exercise of stock options	1,638						846					792
Stock-based compensation	14,342						11,816					2,526
Shanghai dividend	(6,900)											(6,900)
Ending balance (in shares) at Jun. 30, 2024			57,402,253	5,021,811	57,402,253	5,021,811
Ending balance at Jun. 30, 2024	$ 1,001,388				$ 6	$ 1	$ 659,462	$ 198,470		$ 30,060	$ (54,830)	$ 168,219

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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+ Details

ACCOUNTS RECEIVABLE - Summary of Allowance For Doubtful Accounts (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Receivables [Abstract]
Beginning balance	$ 4,830
Less: Allowance for credit losses	(1,954)
Ending balance	$ 6,784

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 324,031		$ 324,031		$ 182,090
Short-term and long-term time deposits	41,839		41,839		121,342
ACM Shanghai
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash payments for procurement of goods and services	9,751	$ 14,500	14,399	$ 25,431
United States
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	40,515		40,515		43,614
Mainland China
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	87,733		87,733		70,418
China Hong Kong
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	194,979		194,979		64,057
Korea
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	737		737		3,934
Singapore
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 67		$ 67		$ 67

STATUTORY SURPLUS RESERVE (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Retained Earnings (Accumulated Deficit) [Abstract]
Statutory surplus reserve	$ 30,060	$ 30,060
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Retained Earnings (Accumulated Deficit) [Abstract]
Statutory surplus reserve	$ 30,060	$ 30,060

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Basic and Diluted Net Income per Common Share (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) class $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) class $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares
Numerator [Abstract]
Net income	$ 31,399	$ 33,597	$ 53,491	$ 42,560
Less: Net income attributable to non-controlling interests	7,189	6,772	11,848	8,590
Net income available to common stockholders, basic	24,210	26,825	41,643	33,970
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	525	303	920	395
Net income available to common stockholders, diluted	$ 23,685	$ 26,522	$ 40,723	$ 33,575
Weighted average shares outstanding, basic (in shares) \| shares	62,178,369	59,898,149	61,772,776	59,817,903
Effect of dilutive securities (in shares) \| shares	4,879,477	5,031,489	4,747,930	5,150,997
Weighted average shares outstanding, diluted (in shares) \| shares	67,057,846	64,929,638	66,520,706	64,968,900
Net income per common share [Abstract]
Basic (in dollars per share) \| $ / shares	$ 0.39	$ 0.45	$ 0.67	$ 0.57
Diluted (in dollars per share) \| $ / shares	$ 0.35	$ 0.41	$ 0.61	$ 0.52
Classes of common stock outstanding \| class	2		2
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares) \| shares	302,561	702,850	394,756	714,850

LEASES (Tables)

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Components of Lease Expense

The components of lease expense were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Operating lease cost	$	1,031	$	1,252	$	2,004	$	1,740
Short-term lease cost	352		310		673		592
Total lease cost	$	1,383	$	1,562	$	2,677	$	2,332

Supplemental Cash Flow Information Related to Operating Leases

Supplemental cash flow information related to operating leases was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Operating cash outflow from operating leases	$	1,031	$	1,252	$	2,004	$	1,740
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$	541	$	—	$	621	$	6,592

Maturities of Outstanding Lease Liabilities for Operating Leases

As of June 30, 2024, maturities of outstanding lease liabilities for all operating leases were as follows:


	December 31,
remainder of 2024	$	1,610
2025	2,082
2026	1,317
2027	1,177
2028 and thereafter	634
Total lease payments	$	6,820
Less: Interest	(568)
Present value of lease liabilities	$	6,252

Weighted Average Remaining Lease Terms and Discount Rates for Operating Leases

The weighted average remaining lease terms and discount rates for all operating leases were as follows:


	June 30, 2024		December 31, 2023
Remaining lease term and discount rate:
Weighted average remaining lease term (years)	3.29		3.44
Weighted average discount rate	3.84	%	3.91	%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Summary of Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Recurring
Assets
Cash and Cash equivalents	$ 35,494	$ 37,518
Short-term investments	19,597	21,312
Total assets	55,091	58,830
Fair Value, Nonrecurring
Assets
Investments accounted for using measurement alternative		10,378
Total assets		10,378
Quoted Prices in Active Markets for Identical Liabilities (Level 1) \| Fair Value, Recurring
Assets
Cash and Cash equivalents	35,494	37,518
Short-term investments	19,597	21,312
Total assets	55,091	58,830
Quoted Prices in Active Markets for Identical Liabilities (Level 1) \| Fair Value, Nonrecurring
Assets
Investments accounted for using measurement alternative		0
Total assets		0
Significant Other Observable Inputs (Level 2) \| Fair Value, Recurring
Assets
Cash and Cash equivalents	0	0
Short-term investments	0	0
Total assets	0	0
Significant Other Observable Inputs (Level 2) \| Fair Value, Nonrecurring
Assets
Investments accounted for using measurement alternative		0
Total assets		0
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring
Assets
Cash and Cash equivalents	0	0
Short-term investments	0	0
Total assets	$ 0	0
Significant Unobservable Inputs (Level 3) \| Fair Value, Nonrecurring
Assets
Investments accounted for using measurement alternative		10,378
Total assets		$ 10,378

LAND USE RIGHT, NET - Summary of Future Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Annual Amortization of Land use Right [Abstract]
remainder of 2024	$ 90
2025	179
2026	179
2027	179
2028	179
2029 and thereafter	7,419
Land use right, net	$ 8,225	$ 8,367

INCOME TAXES - Summary of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Total income tax expense	$ (9,336)	$ (7,638)	$ (13,705)	$ (10,517)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

OTHER LONG-TERM ASSETS (Tables)

6 Months Ended

Jun. 30, 2024

Other Assets, Noncurrent Disclosure [Abstract]

Other Long-term Assets

At June 30, 2024 and December 31, 2023, other long-term assets consisted of the following:


	June 30, 2024		December 31, 2023
Prepayments for property, plant and equipment	$	7,988	$	3,380
Lease deposits	884		834
Security deposit for land use right	692		696
Others	1,353		1,140
Total other long-term assets	$	10,917	$	6,050

OTHER LONG-TERM ASSETS

6 Months Ended

Jun. 30, 2024

Other Assets, Noncurrent Disclosure [Abstract]

OTHER LONG-TERM ASSETS

At June 30, 2024 and December 31, 2023, other long-term assets consisted of the following:


	June 30, 2024		December 31, 2023
Prepayments for property, plant and equipment	$	7,988	$	3,380
Lease deposits	884		834
Security deposit for land use right	692		696
Others	1,353		1,140
Total other long-term assets	$	10,917	$	6,050

PROPERTY, PLANT AND EQUIPMENT, NET (Details) ¥ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 CNY (¥)	Dec. 31, 2023 USD ($)
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	$ 113,550		$ 113,550			$ 112,911
Less: Total accumulated depreciation and amortization	(21,194)		(21,194)			(17,503)
Construction in progress	136,375		136,375			106,440
Total property, plant and equipment, net	228,731		228,731			201,848
Depreciation and amortization expense	2,209	$ 2,241	4,684	$ 3,955
Buildings and plants
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	82,579		82,579			83,109
Buildings and plants \| ACM Lingang
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	35,039		35,039		¥ 249,746
Buildings and plants \| ACM Shanghai
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	47,540		47,540		¥ 338,848
Manufacturing equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	17,235		17,235			16,556
Office equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	5,260		5,260			4,953
Transportation equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	401		401			404
Leasehold improvement
Property, Plant and Equipment, Net, by Type [Abstract]
Property cost	$ 8,075		$ 8,075			$ 7,889

LONG-TERM BORROWINGS - Summary of Scheduled Principal Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Principal Payments of Long-Term Loan [Abstract]
remainder of 2024	$ 4,690
2025	43,952
2026	1,989
2027	33,829
2028	1,994
Thereafter	4,050
Long-term debt	$ 90,504	$ 60,735

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

LONG-TERM BORROWINGS - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
LONG-TERM BORROWINGS - Narrative (Details) $ in Thousands	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) installment loan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Long-term debt	$ 90,504		$ 90,504		$ 60,735
Long-term debt, fair value	84,672		84,672		56,462
Interest costs incurred	507	$ 181	$ 1,077	$ 370
China Merchants Bank
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			120
Line of credit facility, interest rate during period			3.95%
Long-term debt	$ 12,441		$ 12,441		13,362
Bank of China
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			6
Line of credit facility, interest rate during period			2.60%
Number of loans \| loan	2		2
Long-term debt	$ 17,370		$ 17,370		5,013
Bank of China \| Loan Two
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			6
Line of credit facility, interest rate during period			2.62%
Bank of Shanghai
Line of Credit Facility [Line Items]
Line of credit facility, interest rate during period			2.85%
Long-term debt	14,040		$ 14,040		14,120
Citic Bank
Line of Credit Facility [Line Items]
Long-term debt	28,043		$ 28,043		28,240
Citic Bank \| Lone One
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			4
Line of credit facility, interest rate during period			3.10%
Citic Bank \| Loan Two
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			4
Line of credit facility, interest rate during period			4.50%
Everbright Bank
Line of Credit Facility [Line Items]
Number of installments for loan repayable \| installment			6
Line of credit facility, interest rate during period			2.60%
Long-term debt	$ 18,610		$ 18,610		$ 0

LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Components of lease expense [Abstract]
Operating lease cost	$ 1,031	$ 1,252	$ 2,004	$ 1,740
Short-term lease cost	352	310	673	592
Total lease cost	$ 1,383	$ 1,562	$ 2,677	$ 2,332

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of Credit Risk (Details) - Customer Concentration Risk	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue Benchmark \| Three Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage			52.10%	51.90%
Revenue Benchmark \| One Customer
Concentration of Credit Risk [Abstract]
Concentration risk, percentage					17.50%
Revenue Benchmark \| Four Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	57.90%
Accounts Receivable \| Four Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage		59.10%		55.90%

SHORT-TERM INVESTMENTS - Summary of Unrealized Gain (Loss) on Trading Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Unrealized gain (loss) recognized during the reporting period on short-term investment still held at June 30	$ 1,031	$ (2,455)	$ (1,564)	$ (3,109)
Net gain recognized during the period on short-term sold during the period	0	3,919	273	7,913
Total net gain (loss) recognized at June 30 on short-term investment	$ 1,031	$ 1,464	$ (1,291)	$ 4,804

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 324,031	$ 182,090
Restricted cash	881	1,083
Short-term time deposits (note 2)	27,183	80,524
Short-term investments (note 15)	19,597	21,312
Accounts receivable, net (note 4)	293,499	283,186
Inventories, net (note 5)	602,927	545,395
Prepaid expenses	18,594	20,023
Total current assets	1,343,162	1,176,110
Property, plant and equipment, net (note 6)	228,731	201,848
Land use right, net (note 7)	8,225	8,367
Operating lease right-of-use assets, net (note 11)	6,252	7,026
Intangible assets, net	2,836	2,538
Long-term time deposits (note 2)	14,656	40,818
Deferred tax assets (note 19)	20,898	20,271
Long-term investments (note 14)	31,898	27,880
Other long-term assets (note 8)	10,917	6,050
Total assets	1,667,575	1,490,908
Current liabilities:
Short-term borrowings (note 9)	54,439	31,335
Current portion of long-term borrowings (note 12)	19,671	6,783
Advances from customers (note 3)	205,609	181,368
Deferred revenue (note 3)	5,279	3,687
Income taxes payable (note 19)	11,136	6,401
FIN-48 payable (note 19)	12,093	12,149
Other payables and accrued expenses (note 10)	114,940	102,951
Current portion of operating lease liabilities (note 11)	2,573	2,764
Total current liabilities	586,170	500,659
Long-term borrowings (note 12)	70,833	53,952
Long-term operating lease liabilities (note 11)	3,679	4,262
Other long-term liabilities (note 13)	5,505	5,873
Total liabilities	666,187	564,746
Commitments and contingencies (note 21)
Equity:
Additional paid-in capital	659,462	629,845
Retained earnings	198,470	156,827
Statutory surplus reserve (note 22)	30,060	30,060
Accumulated other comprehensive loss	(54,830)	(49,349)
Total ACM Research, Inc. stockholders’ equity	833,169	767,390
Non-controlling interests	168,219	158,772
Total equity	1,001,388	926,162
Total liabilities and equity	1,667,575	1,490,908
Class A Common Stock
Equity:
Common stock	6	6
Class B Common Stock
Equity:
Common stock	1	1
Related Party
Current assets:
Other receivables	2,756	2,432
Current liabilities:
Accounts payable	18,012	11,407
Nonrelated Party
Current assets:
Other receivables	53,694	40,065
Current liabilities:
Accounts payable	$ 142,418	$ 141,814

SHORT-TERM BORROWINGS

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

SHORT-TERM BORROWINGS

At June 30, 2024 and December 31, 2023, short-term borrowings consisted of the following:


	June 30, 2024		December 31, 2023
Line of credit up to RMB 150,000 from China Everbright Bank,
1)due on August 29, 2024 with an annual interest rate of 3.00%.	2,449		2,463
Line of credit up to RMB 40,000 from Bank of China,
1)due on September 7, 2024 with an annual interest rate of 2.87%.	5,616		5,648
Line of credit up to RMB 200,000 from China Merchants Bank,
1)due on August 7, 2024 with an annual interest rate of 3.00%.	1,264		1,271
2)due on August 8, 2024 with an annual interest rate of 3.00%.	1,264		1,271
3)due on August 9, 2024 with an annual interest rate of 3.00%.	1,264		1,271
4)due on August 14, 2024 with an annual interest rate of 3.00%.	1,264		1,271
5)due on August 17, 2024 with an annual interest rate of 3.00%.	1,264		1,271
6)due on August 20, 2024 with an annual interest rate of 3.00%.	1,264		1,271
7)due on August 21, 2024 with an annual interest rate of 3.00%.	1,264		1,271
8)due on August 22, 2024 with an annual interest rate of 3.00%.	1,264		1,271
9)due on August 24, 2024 with an annual interest rate of 3.00%.	1,264		1,271
10)due on August 27, 2024 with an annual interest rate of 3.00%.	1,264		1,271
11)due on August 29, 2024 with an annual interest rate of 3.00%.	1,264		1,271
12)due on August 30, 2024 with an annual interest rate of 3.00%.	1,264		1,271
13)due on September 3, 2024 with an annual interest rate of 3.00%.	1,264		1,271
14)due on September 5, 2024 with an annual interest rate of 3.00%.	1,264		1,270
15)due on September 6, 2024 with an annual interest rate of 3.00%.	1,263		1,270
16)due on September 10, 2024 with an annual interest rate of 3.00%.	1,263		1,270
17)due on September 12, 2024 with an annual interest rate of 3.00%.	1,263		1,270
18)due on February 27, 2025 with an annual interest rate of 2.60%.	1,333		—
19)due on February 28, 2025 with an annual interest rate of 2.60%.	1,333		—
20)due on March 1, 2025 with an annual interest rate of 2.60%.	1,333		—
21)due on March 5, 2025 with an annual interest rate of 2.60%.	1,333		—
22)due on March 8, 2025 with an annual interest rate of 2.60%.	1,263		—
Line of credit up to RMB 120,000 from Bank of China,
1)due on March 20, 2025 with an annual interest rate of 2.75%.	16,848		—
Line of credit up to KRW 500,000 from Industrial Bank of Korea,
1)due on July 12, 2024 with an annual interest rate of 6.03%.	—		77
Line of credit up to KRW 2,000,000 from Industrial Bank of Korea,
1)due on December 15, 2024 with an annual interest rate of 4.27%.	1,446		1,544
Total	$	54,439	$	31,335

For the three months ended June 30, 2024 and 2023, interest expense related to short-term borrowings amounted to $425 and $484, respectively, and for the six months ended June 30, 2024 and 2023, interest expense related to short-term borrowings amounted to $638 and $974, respectively.

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2024

Segment Reporting [Abstract]

Long-Lived Assets by Geography

Long-lived assets by geographic region as of the periods ended were as follows:


	June 30, 2024		December 31, 2023
Long-lived assets by geography:
Mainland China	$	241,246	$	209,725
Korea	11,631		12,190
United States	1,248		1,276
Total	$	254,125	$	223,191

SUBSEQUENT EVENTS (Details) - Subsequent Event $ in Thousands	Jul. 30, 2024 USD ($) ft²
Subsequent Event [Line Items]
Area for development and production center, total floor space	39,500
Area for development and production center, space used for clean room	5,200
Commercial facility agreement, purchase price \| $	$ 7,750

STOCK-BASED COMPENSATION, Share Option Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Number of Option Share [Roll Forward]
Forfeited/cancelled (in shares)		(92,308)
Employee Share Option
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		9,998,637
Granted (in shares)		194,500
Exercised (in shares)		(1,205,938)
Forfeited/cancelled (in shares)		(43,735)
Outstanding, end of period (in shares)	8,943,464	8,943,464	9,998,637
Vested and exercisable (in shares)	5,052,597	5,052,597
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 5.15
Granted (in dollars per share)		17.27
Exercised (in dollars per share)		2.25
Forfeited/cancelled (in dollars per share)		11.08
Outstanding at end of period (in dollars per share)	$ 5.77	5.77	$ 5.15
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		9.59
Granted (in dollars per share)		23.16
Exercised (in dollars per share)		4.83
Forfeited/cancelled (in dollars per share)		23.34
Outstanding, end of period (in dollars per share)	$ 10.33	$ 10.33	$ 9.59
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		6 years 10 days	6 years 2 months 1 day
Unrecognized employee stock-based compensation expense	$ 25,217	$ 25,217
Cost not yet recognized		3 years 7 months 6 days
Intrinsic value	7,212	$ 29,077
Intrinsic value, outstanding	119,032	119,032
Intrinsic value, exercisable	81,303	$ 81,303
Employee Share Option \| ACM Shanghai
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		1 year 8 months 12 days
Unrecognized employee stock-based compensation expense	$ 60,798	$ 60,798
Employee Share Option \| ACM Shanghai \| 2019 Stock Option Incentive Plan
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		3,134,883
Exercised (in shares)		(446,154)
Outstanding, end of period (in shares)	2,596,421	2,596,421	3,134,883
Vested and exercisable (in shares)	2,596,421	2,596,421
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 0.24
Exercised (in dollars per share)		0.24
Forfeited/cancelled (in dollars per share)		0.24
Outstanding at end of period (in dollars per share)	$ 0.24	0.24	$ 0.24
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		1.85
Exercised (in dollars per share)		1.85
Forfeited/cancelled (in dollars per share)		1.85
Outstanding, end of period (in dollars per share)	$ 1.85	$ 1.85	$ 1.85
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		6 months 3 days	10 months 6 days
Intrinsic value	$ 5,198	$ 5,198
Intrinsic value, outstanding	26,124	26,124
Intrinsic value, exercisable	$ 26,124	$ 26,124
Employee Share Option \| ACM Shanghai \| 2023 Subsidiary Stock Option Plan
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		10,575,500
Granted (in shares)		1,391,000
Forfeited/cancelled (in shares)		(201,065)
Outstanding, end of period (in shares)	11,765,435	11,765,435	10,575,500
Vested and exercisable (in shares)	0	0
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 9.49
Granted (in dollars per share)		6.04
Forfeited/cancelled (in dollars per share)		9.09
Outstanding at end of period (in dollars per share)	$ 9.01	9.01	$ 9.49
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		7.06
Granted (in dollars per share)		7.00
Forfeited/cancelled (in dollars per share)		7.06
Outstanding, end of period (in dollars per share)	$ 7.00	$ 7.00	$ 7.06
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		2 years 8 months 12 days	3 years 1 month 2 days
Employee Share Option \| ACM Shanghai \| 2023 Stock Option Incentive Plan
Weighted Average Remaining Contractual Term
Intrinsic value	$ 0	$ 0
Intrinsic value, outstanding	57,491	57,491
Intrinsic value, exercisable	$ 0	$ 0
Non-Employee Stock Option
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		1,170,795
Exercised (in shares)		(160,143)
Forfeited/cancelled (in shares)		(3,188)
Outstanding, end of period (in shares)	1,007,464	1,007,464	1,170,795
Vested and exercisable (in shares)	1,007,464	1,007,464
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 0.42
Exercised (in dollars per share)		0.22
Forfeited/cancelled (in dollars per share)		0.22
Outstanding at end of period (in dollars per share)	$ 0.45	0.45	$ 0.42
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		1.31
Exercised (in dollars per share)		0.50
Forfeited/cancelled (in dollars per share)		0.50
Outstanding, end of period (in dollars per share)	$ 1.44	$ 1.44	$ 1.31
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		2 years 4 months 2 days	2 years 7 months 28 days
Unrecognized employee stock-based compensation expense	$ 0	$ 0
Cost not yet recognized		0 years
Intrinsic value	1,511	$ 4,267
Intrinsic value, outstanding	21,778	21,778
Intrinsic value, exercisable	$ 21,778	$ 21,778

DESCRIPTION OF BUSINESS (Details)	Jun. 30, 2024	Dec. 31, 2023
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM Research (Wuxi), Inc. ("ACM Wuxi")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
CleanChip Technologies Limited ("CleanChip")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM Research Korea CO., LTD.
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM Research (Lingang), Inc. ("ACM Lingang")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM Research (CA), Inc. ("ACM California")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM Research (Cayman), Inc.
Description of Business [Abstract]
Effective interest held as at	100.00%	100.00%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")
Description of Business [Abstract]
Effective interest held as at	100.00%	100.00%
ACM Research (Beijing), Inc. ("ACM Beijing")
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
Hanguk ACM CO., LTD
Description of Business [Abstract]
Effective interest held as at	100.00%	100.00%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	82.00%	82.10%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	59.30%	59.40%

REVENUE FROM CONTRACTS WITH CUSTOMERS - Accounts Receivables and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Accounts receivable	$ 293,499	$ 283,186
Advances from customers	205,609	181,368
Deferred revenue	$ 5,279	$ 3,687

LONG-TERM BORROWINGS - Summary of Long-term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Long-Term Borrowings [Abstract]
Long-term debt	$ 90,504	$ 60,735
Less: Current portion	(19,671)	(6,783)
Long-term Borrowings	70,833	53,952
China Merchants Bank
Long-Term Borrowings [Abstract]
Long-term debt	12,441	13,362
Bank of China
Long-Term Borrowings [Abstract]
Long-term debt	17,370	5,013
Bank of Shanghai
Long-Term Borrowings [Abstract]
Long-term debt	14,040	14,120
Citic Bank
Long-Term Borrowings [Abstract]
Long-term debt	28,043	28,240
Everbright Bank
Long-Term Borrowings [Abstract]
Long-term debt	$ 18,610	$ 0

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

PROPERTY, PLANT AND EQUIPMENT, NET

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

At June 30, 2024 and December 31, 2023, property, plant and equipment consisted of the following:


	June 30, 2024		December 31, 2023
Buildings and plants	$	82,579	$	83,109
Manufacturing equipment	17,235		16,556
Office equipment	5,260		4,953
Transportation equipment	401		404
Leasehold improvement	8,075		7,889
Total cost	113,550		112,911
Less: Total accumulated depreciation and amortization	(21,194)		(17,503)
Construction in progress	136,375		106,440
Total property, plant and equipment, net	$	228,731	$	201,848

Depreciation expense for the three months ended June 30, 2024 and 2023 was $2,209 and $2,241, respectively, and $4,684 and $3,955 for the six months ended June 30, 2024 and 2023, respectively. Buildings and plants represent Lingang housing property owned by ACM Lingang at a value of RMB 249,746 ($35,039), and facilities for the new headquarters of ACM Shanghai ("Zhangjiang New Building") at a value of RMB 338,848 ($47,540), as of June 30, 2024. The Lingang housing property is pledged as security for loans from China Merchants Bank (Note 12).

Construction in progress primarily reflects costs incurred related to the construction of ACM Shanghai’s Lingang development and production center, which is scheduled to begin initial production in the second half of 2024.

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]

- Definition

Indicates amendment to accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476173/280-10-65-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476173/280-10-65-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482615/740-10-65-9

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 9
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482615/740-10-65-9

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+ Details

LEASES

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

LEASES

The Company leases space under non-cancelable operating leases for several offices and manufacturing locations. These leases do not have significant rent escalation holidays, concessions, leasehold improvement incentives, or other build-out clauses. Further, the leases do not contain contingent rent provisions.

Most leases include one or more options to renew. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term.

The components of lease expense were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Operating lease cost	$	1,031	$	1,252	$	2,004	$	1,740
Short-term lease cost	352		310		673		592
Total lease cost	$	1,383	$	1,562	$	2,677	$	2,332

Supplemental cash flow information related to operating leases was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Operating cash outflow from operating leases	$	1,031	$	1,252	$	2,004	$	1,740
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$	541	$	—	$	621	$	6,592

As of June 30, 2024, maturities of outstanding lease liabilities for all operating leases were as follows:


	December 31,
remainder of 2024	$	1,610
2025	2,082
2026	1,317
2027	1,177
2028 and thereafter	634
Total lease payments	$	6,820
Less: Interest	(568)
Present value of lease liabilities	$	6,252

The weighted average remaining lease terms and discount rates for all operating leases were as follows:


	June 30, 2024		December 31, 2023
Remaining lease term and discount rate:
Weighted average remaining lease term (years)	3.29		3.44
Weighted average discount rate	3.84	%	3.91	%