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INCOME TAXES (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Subsidiary
Mar. 31, 2020
USD ($)
Income Taxes [Abstract]    
Statutory U.S federal income tax rate 21.00%  
Unrecognized tax benefits $ 570  
Unrecognized tax benefits that would impact effective tax rate 422  
Interest or penalties 0  
Income Tax Benefit (Expense) [Abstract]    
Total income tax benefit (expense) $ 2,770 $ (304)
PRC [Member]    
Income Taxes [Abstract]    
Number of subsidiaries | Subsidiary 3  
Foreign corporate tax rate 25.00%  
Effective period of preferential income tax rate 3 years  
PRC [Member] | Minimum [Member]    
Income Taxes [Abstract]    
Foreign corporate tax rate 15.00%  
PRC [Member] | Maximum [Member]    
Income Taxes [Abstract]    
Foreign corporate tax rate 25.00%  
PRC [Member] | ACM Research (Shanghai), Inc. [Member]    
Income Taxes [Abstract]    
Foreign corporate tax rate 15.00%  
PRC [Member] | ACM Research (Wuxi), Inc. [Member]    
Income Taxes [Abstract]    
Foreign corporate tax rate 25.00%  
PRC [Member] | Shengwei Research (Shanghai), Inc. [Member]    
Income Taxes [Abstract]    
Foreign corporate tax rate 25.00%