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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]  
Cash and Cash Equivalents
The following table presents cash and cash equivalents, according to jurisdiction as of March 31, 2023 and December 31, 2022:
March 31,
2023		December 31,
2022
United States$22,161 $25,011 
Mainland China159,438 129,695 
China Hong Kong77,148 89,187 
South Korea1,589 4,007 
Singapore51 51 
Total$260,387 $247,951 
Summary of Time Deposits
At March 31, 2023 and December 31, 2022, time deposits consisted of the following:
March 31,
2023		December 31,
2022
Deposit in China Merchant Bank which matured on January 29, 2023 with an annual interest rate of 2.25%
$— $38,772 
Deposit in China Everbright Bank which matured on January 29, 2023 with an annual interest rate of 2.25%
$— $14,360 
Deposit in China Everbright Bank which matures on May 22, 2023 with an annual interest rate of 5.07%
$2,999 $3,000 
Deposit in China Industrial Bank which matured on January 30, 2023 with an annual interest rate of 2.15%
$— $14,360 
Deposit in China Merchant Bank which matures on January 29, 2024 with an annual interest rate of 3.15%
$14,550 $- 
Deposit in China Merchant Bank which matures on January 29, 2024 with an annual interest rate of 2.85%
$29,100 $28,720 
Deposit in Bank of Ningbo which matures on February 17, 2024 with an annual interest rate of 2.85%
$43,650 $43,080 
Deposit in Shanghai Pudong Development Bank which matures on October 20, 2025 with an annual interest rate of 3.10%
$7,275 $7,180 
Deposit in Shanghai Pudong Development Bank which matures on November 14, 2025 with an annual interest rate of 3.10%
$7,275 $7,180 
Deposit in Shanghai Pudong Development Bank which matures on December 8, 2025 with an annual interest rate of 3.10%
$4,365 $4,308 
Deposit in Shanghai Pudong Development Bank which matures on December 15, 2025 with an annual interest rate of 3.10%
$4,365 $4,308 
Deposit in Shanghai Pudong Development Bank which matures on December 30, 2025 with an annual interest rate of 3.10%
$7,275 $7,180 
$120,854 $172,448 
Fair Value, by Balance Sheet Grouping
Quoted Prices in Active Markets for Identical Liabilities (Level 1)Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)Total
As of March 31, 2023:
Assets
Cash equivalents$260,387 $— $— $260,387 
Trading securities12,733 — — $12,733 
$273,120 $— $— $273,120 
Liabilities
Short-term borrowings$— $56,745 $— $56,745 
Long-term borrowings— 20,614 — $20,614 
$— $77,359 $— $77,359 
As of December 31, 2022:
Assets
Cash equivalents$247,951 $— $— $247,951 
Trading securities20,209 — — $20,209 
$268,160 $— $— $268,160 
Liabilities
Short-term borrowings$— $56,004 $— $56,004 
Long-term borrowings— 21,009 — $21,009 
$— $77,013 $— $77,013 
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 March 31,
20232022
Numerator:
Net income (loss)$8,963 $(7,443)
Less: Net income (loss) attributable to non-controlling interests1,818 (1,657)
Net income (loss) available to common stockholders, basic$7,145 $(5,786)
Less: Dilutive effect arising from stock-based awards by ACM Shanghai93 (86)
Net income (loss) available to common stockholders, diluted$7,052 $(5,700)
Weighted average shares outstanding, basic (1)59,736,76458,827,390
Effect of dilutive securities5,322,0130
Weighted average shares outstanding, diluted (2)65,058,77758,827,390
Net income per share of common stock:
Basic$0.12 $(0.10)
Diluted (2)$0.11 $(0.10)
(1)Prior period results reflect the three-for-one stock split effected in the form of a stock dividend in March 2022. See Note 1 for details.
(2)Weighted average diluted shares of common stock outstanding and net income (loss) attributable to ACM research, Inc. per diluted share of common stock for the first quarter of 2022 was incorrectly reported as 65,950,922 and ($0.09), respectively, in the prior year filing.