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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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