Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenue (note 3)	$ 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:
Sales and marketing	26,733	16,773	11,902
Research and development	34,207	19,119	12,900
General and administrative	15,214	12,215	8,061
Total operating expenses, net	76,154	48,107	32,863
Income from operations	38,702	21,492	17,791
Interest income	505	897	333
Interest expense	(765)	(982)	(745)
Change in fair value of financial liability	0	(11,964)	0
Unrealized gain on trading securities	607	12,574	0
Other income (expenses), net	(631)	(3,377)	1,393
Equity income in net income of affiliates	4,637	655	168
Income before income taxes	43,055	19,295	18,940
Income tax benefit (expense) (note 21)	(134)	2,382	518
Net income	42,921	21,677	19,458
Less: Net income attributable to non-controlling interests and redeemable non-controlling interests	5,164	2,897	564
Net income attributable to ACM Research, Inc.	37,757	18,780	18,894
Comprehensive income:
Net income	42,921	21,677	19,458
Foreign currency translation adjustment	4,695	10,493	(899)
Comprehensive Income	47,616	32,170	18,559
Less: Comprehensive income attributable to non-controlling interests and redeemable non-controlling interests	5,607	6,858	483
Comprehensive income attributable to ACM Research, Inc.	$ 42,009	$ 25,312	$ 18,076
Net income attributable to ACM Research, Inc. per common share (note 2):
Basic (in dollars per share)	$ 1.96	$ 1.03	$ 1.12
Diluted (in dollars per share)	$ 1.73	$ 0.89	$ 0.99
Weighted average common shares outstanding used in computing per share amounts (note 2):
Basic (in shares)	19,218,236	18,233,361	16,800,623
Diluted (in shares)	21,785,572	21,183,469	19,135,497