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INCOME TAXES (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Subsidiary
Sep. 30, 2019
USD ($)
Income Taxes [Abstract]        
Statutory U.S federal income tax rate     21.00%  
Total income tax benefit (expense) $ 1,747 $ 328 $ (416) $ (667)
Unrecognized tax benefits 155   155  
Interest or penalties 0      
Income Tax Expense [Abstract]        
Total income tax benefit (expense) $ 1,747 $ 328 $ (416) $ (667)
China [Member]        
Income Taxes [Abstract]        
Number of subsidiaries | Subsidiary     3  
Effective period of preferential income tax rate     3 years  
China [Member] | ACM Research (Shanghai), Inc. [Member]        
Income Taxes [Abstract]        
Foreign corporate tax rate     15.00%  
China [Member] | ACM Research (Wuxi), Inc. [Member]        
Income Taxes [Abstract]        
Foreign corporate tax rate     25.00%  
China [Member] | Shengwei Research (Shanghai), Inc. [Member]        
Income Taxes [Abstract]        
Foreign corporate tax rate     25.00%