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DESCRIPTION OF BUSINESS (Tables) | 3 Months Ended
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Mar. 31, 2021
DESCRIPTION OF BUSINESS [Abstract] |
Direct or Indirect Interests of Subsidiaries | The Company has direct or indirect interests in the following subsidiaries:
|  |  | Effective interest held as at |
Name of subsidiaries | Place and date of incorporation |  | March 31, 2021 |  |  | December 31, 2020 |
ACM Research (Shanghai), Inc. | PRC, May 2005 |  |  | 91.7 | % |  |  | 91.7 | %
ACM Research (Wuxi), Inc. | PRC, July 2011 |  |  | 91.7 | % |  |  | 91.7 | %
CleanChip Technologies Limited | Hong Kong, June 2017 |  |  | 91.7 | % |  |  | 91.7 | %
ACM Research Korea CO., LTD. | Korea, December 2017 |  |  | 91.7 | % |  |  | 91.7 | %
Shengwei Research (Shanghai), Inc. | PRC, March 2019 |  |  | 91.7 | % |  |  | 91.7 | %
ACM Research (CA), Inc. | USA, June 2019 |  |  | 91.7 | % |  |  | 91.7 | %
ACM Research (Cayman), Inc. | Cayman Islands, April 2019 |  |  | 100.0 | % |  |  | 100.0 | %

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