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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2023
Accounting Policies [Abstract]  
Cash and Cash Equivalents
The following table presents cash and cash equivalents, according to jurisdiction as of September 30, 2023 and December 31, 2022:
September 30,
2023		December 31,
2022
United States$36,251 $25,011 
Mainland China109,992 129,695 
China Hong Kong56,731 89,187 
Korea
4,060 4,007 
Singapore67 51 
Total$207,101 $247,951 
Summary of Time Deposits
At September 30, 2023 and December 31, 2022, time deposits consisted of the following:
September 30,
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 matured on May 22, 2023 with an annual interest rate of 5.07%
$— $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 2.85%
$27,860 $28,720 
Deposit in Bank of Ningbo which matures on February 17, 2024 with an annual interest rate of 2.85%
$41,790 $43,080 
Deposit in Shanghai Pudong Development Bank which matures on October 20, 2025 with an annual interest rate of 3.10%
$6,965 $7,180 
Deposit in Shanghai Pudong Development Bank which matures on November 14, 2025 with an annual interest rate of 3.10%
$6,965 $7,180 
Deposit in Shanghai Pudong Development Bank which matures on December 8, 2025 with an annual interest rate of 3.10%
$4,179 $4,308 
Deposit in Shanghai Pudong Development Bank which matures on December 15, 2025 with an annual interest rate of 3.10%
$4,179 $4,308 
Deposit in Shanghai Pudong Development Bank which matures on December 30, 2025 with an annual interest rate of 3.10%
$6,965 $7,180 
Deposit in China Industrial Bank which matures on January 30, 2026 with an annual interest rate of 3.15%
$13,930 $— 
Deposit in China Everbright Bank which matures on November 22, 2023 with an annual interest rate of 5.43%
$3,000 $— 
Deposit in China Everbright Bank which matures on January 5, 2024 with an annual interest rate of 5.38%
$3,001 $— 
$118,834 $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 September 30, 2023:
Assets
Cash and cash equivalents
$207,101 $— $— $207,101 
Short-term investments
21,844 — — 21,844 
$228,945 $— $— $228,945 
As of December 31, 2022:
Assets
Cash and cash equivalents
$247,951 $— $— $247,951 
Short-term investments
20,209 — — 20,209 
$268,160 $— $— $268,160 
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 September 30,Nine Months Ended September 30,
2023202220232022
Numerator:
Net income $30,994 $27,076 $73,554 $36,381 
Less: Net income attributable to non-controlling interests5,315 6,072 13,905 8,927 
Net income available to common stockholders, basic$25,679 $21,004 $59,649 $27,454 
Less: Dilutive effect arising from stock-based awards by ACM Shanghai461 321 1,338 465 
Net income available to common stockholders, diluted$25,218 $20,683 $58,311 $26,989 
Weighted average shares outstanding, basic 60,219,21859,360,79059,953,14459,123,895
Effect of dilutive securities5,231,7236,251,8754,880,9076,505,378
Weighted average shares outstanding, diluted65,450,94165,612,66564,834,05165,629,273
Net income per share of common stock:
Basic$0.43 $0.35 $0.99 $0.46 
Diluted$0.39 $0.32 $0.90 $0.41