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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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Term to complete listing of shares of ACM Shanghai on the Shanghai Stock Exchange's new Sci-Tech innovation board known as Star Market.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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