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DESCRIPTION OF BUSINESS (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 13, 2017	Mar. 31, 2021	Dec. 31, 2019 USD ($)	Dec. 31, 2020	Nov. 08, 2017	Aug. 31, 2017
Class A Common Stock [Member]
Description of Business [Abstract]
Reverse stock split	0.33
Class B Common Stock [Member]
Description of Business [Abstract]
Reverse stock split	0.33
ACM Research (Shanghai), Inc. [Member]
Description of Business [Abstract]
Purchase of equity interest percentage		8.30%			18.36%	18.77%
Name of subsidiaries		ACM Research (Shanghai), Inc.
Term to complete listing of shares		3 years
Date and place of Incorporation		PRC, May 2005
Effective interest held as at		91.70%		91.70%
ACM Research (Wuxi), Inc. [Member]
Description of Business [Abstract]
Name of subsidiaries		ACM Research (Wuxi), Inc.
Date and place of Incorporation		PRC, July 2011
Effective interest held as at		91.70%		91.70%
CleanChip Technologies Limited [Member]
Description of Business [Abstract]
Proceeds from sale of interest in subsidiary			$ 3,500
Name of subsidiaries		CleanChip Technologies Limited
Date and place of Incorporation		Hong Kong, June 2017
Effective interest held as at		91.70%		91.70%
ACM Research Korea CO., LTD [Member]
Description of Business [Abstract]
Name of subsidiaries		ACM Research Korea CO., LTD.
Date and place of Incorporation		Korea, December 2017
Effective interest held as at		91.70%		91.70%
Shengwei Research (Shanghai), Inc. [Member]
Description of Business [Abstract]
Purchase of equity interest percentage			91.70%
Name of subsidiaries		Shengwei Research (Shanghai), Inc.
Date and place of Incorporation		PRC, March 2019
Effective interest held as at		91.70%		91.70%
ACM Research (CA), Inc. [Member]
Description of Business [Abstract]
Name of subsidiaries		ACM Research (CA), Inc.
Date and place of Incorporation		USA, June 2019
Effective interest held as at		91.70%		91.70%
ACM Research (Cayman), Inc. [Member]
Description of Business [Abstract]
Name of subsidiaries		ACM Research (Cayman), Inc.
Date and place of Incorporation		Cayman Islands, April 2019
Effective interest held as at		100.00%		100.00%

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