Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) [Abstract]
Revenue	$ 47,665	$ 33,427	$ 111,062	$ 82,916
Cost of revenue	27,324	17,173	61,137	44,705
Gross profit	20,341	16,254	49,925	38,211
Operating expenses:
Sales and marketing	3,924	3,886	11,524	8,679
Research and development	4,343	3,492	13,241	9,598
General and administrative	4,568	1,846	9,100	5,992
Total operating expenses, net	12,835	9,224	33,865	24,269
Income from operations	7,506	7,030	16,060	13,942
Interest income	179	95	834	128
Interest expense	(272)	(205)	(611)	(538)
Change in fair value of financial liability	(6,533)	0	(11,964)	0
Unrealized gain on trading securities	8,970	0	8,970	0
Other income (expense), net	(1,759)	1,850	(933)	2,132
Equity income (loss) in net income (loss) of affiliates	182	(9)	539	260
Income before income taxes	8,273	8,761	12,895	15,924
Income tax benefit (expense) (note 17)	1,747	328	(416)	(667)
Net income	10,020	9,089	12,479	15,257
Less: Net income attributable to non-controlling interests and redeemable non-controlling interests	1,393	307	2,228	307
Net income attributable to ACM Research, Inc.	8,627	8,782	10,251	14,950
Comprehensive income:
Net income	10,020	9,089	12,479	15,257
Foreign currency translation adjustment	5,757	(2,591)	4,099	(2,902)
Comprehensive Income	15,777	6,498	16,578	12,355
Less: Comprehensive income attributable to non-controlling interests and redeemable non-controlling interests	2,698	307	3,614	307
Comprehensive income attributable to ACM Research, Inc.	$ 13,079	$ 6,191	$ 12,964	$ 12,048
Net income attributable to ACM Research, Inc. per common share (note 2):
Basic (in dollars per share)	$ 0.47	$ 0.52	$ 0.57	$ 0.91
Diluted (in dollars per share)	$ 0.40	$ 0.45	$ 0.48	$ 0.80
Weighted average common shares outstanding used in computing per share amounts (note 2):
Basic (in shares)	18,201,943	16,999,746	18,124,665	16,381,944
Diluted (in shares)	21,555,296	19,354,214	21,257,661	18,699,010