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DESCRIPTION OF BUSINESS (Details) ¥ in Thousands, $ in Thousands |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2019 | Jun. 12, 2019 USD ($) Investor | Jun. 12, 2019 CNY (¥) Investor | Sep. 13, 2017 | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 CNY (¥) | 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 |  |  |  |  |  |  |  | 18.36% | 18.77%
Term to complete listing of shares | 3 years |  |  |  |  |  |  |  |
Number of investors with agreements entered | Investor |  | 7 | 7 |  |  |  |  |  |
Purchase price of stock agreed by investors |  | $ 27,300 | ¥ 187,900 |  |  |  |  |  |
Percentage of outstanding shares to be sold to investors |  | 4.20% | 4.20% |  | 4.20% |  |  |  |
Shengwei Research (Shanghai), Inc. [Member] |  |  |  |  |  |  |  |  |
Description of Business [Abstract] |  |  |  |  |  |  |  |  |
Registered capital |  |  |  |  |  | $ 727 | ¥ 5,000 |  |
Capital injected in subsidiary | $ |  |  |  |  | $ 0 |  |  |  |

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