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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Basic and Diluted Net Income per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator [Abstract]    
Net income $ 5,822 $ 1,963
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
Weighted average shares outstanding, basic (in shares) 18,786,870 18,120,363
Effect of dilutive securities (in shares) 3,081,410 2,946,273
Weighted average shares outstanding, diluted (in shares) 21,868,280 21,066,636
Net income per common share:    
Basic (in dollars per share) $ 0.29 $ 0.09
Diluted (in dollars per share) $ 0.25 $ 0.08