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Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]    
Revenue (note 3) $ 43,732 $ 24,348
Cost of revenue 25,687 14,120
Gross profit 18,045 10,228
Operating expenses:    
Sales and marketing 5,308 3,005
Research and development 5,504 3,677
General and administrative 3,783 2,328
Total operating expenses, net 14,595 9,010
Income from operations 3,450 1,218
Interest income 49 335
Interest expense (189) (111)
Unrealized loss on trading securities (1,047) 0
Other income, net 469 677
Equity income in net income of affiliates 320 148
Income before income taxes 3,052 2,267
Income tax benefit (expense) (note 20) 2,770 (304)
Net income 5,822 1,963
Less: Net income attributable to non-controlling interests and redeemable non-controlling interests 352 258
Net income attributable to ACM Research, Inc. 5,470 1,705
Comprehensive income:    
Net income 5,822 1,963
Foreign currency translation adjustment (1,332) (1,900)
Comprehensive Income 4,490 63
Less: Comprehensive income attributable to non-controlling interests and redeemable non-controlling interests (83) (694)
Comprehensive income attributable to ACM Research, Inc. $ 4,573 $ 757
Net income attributable to ACM Research, Inc. per common share (note 2):    
Basic (in dollars per share) $ 0.29 $ 0.09
Diluted (in dollars per share) $ 0.25 $ 0.08
Weighted average common shares outstanding used in computing per share amounts (note 2):    
Basic (in shares) 18,786,870 18,120,363
Diluted (in shares) 21,868,280 21,066,636