DESCRIPTION OF BUSINESS (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
ACM Research (Shanghai), Inc. [Member]
Description of Business [Abstract]
Purchase of equity interest percentage	8.30%
Name of subsidiaries	ACM Research (Shanghai), Inc.
Term to complete listing of shares	3 years
Date and place of Incorporation	China, 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	China, 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	China, 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%