PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION, Condensed Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 259,751	$ 156,624	$ 107,524
Cost of revenue	(144,895)	(87,025)	(56,870)
Gross profit	114,856	69,599	50,654
Operating expenses [Abstract]
Sales and marketing expenses	(26,733)	(16,773)	(11,902)
General and administrative expenses	(15,214)	(12,215)	(8,061)
Research and development expenses	(34,207)	(19,119)	(12,900)
Income from operations	38,702	21,492	17,791
Equity in earnings of unconsolidated subsidiaries	4,637	655	168
Change in fair value of financial liability	0	(11,964)	0
Interest income, net	505	897	333
Interest expense, net	(765)	(982)	(745)
Income before income taxes	43,055	19,295	18,940
Income tax expense	134	(2,382)	(518)
Net income attributable to ACM Research, Inc.	37,757	18,780	18,894
Parent Company [Member]
Income Statement [Abstract]
Revenue	16	1,776	10,683
Cost of revenue	0	(1,707)	(10,036)
Gross profit	16	69	647
Operating expenses [Abstract]
Sales and marketing expenses	(2,443)	(1,361)	(490)
General and administrative expenses	(5,116)	(5,010)	(3,639)
Research and development expenses	0	0	(476)
Income from operations	(7,543)	(6,302)	(3,958)
Equity in earnings of unconsolidated subsidiaries	43,866	36,273	22,510
Change in fair value of financial liability	0	(11,964)	0
Interest income, net	54	90	231
Interest expense, net	0	0	(67)
Other income, net	1,380	683	178
Income before income taxes	37,757	18,780	18,894
Income tax expense	0	0	0
Net income attributable to ACM Research, Inc.	$ 37,757	$ 18,780	$ 18,894