Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock Class A	Common Stock Class B	Common Stock Common Stock Class A	Common Stock Common Stock Class B	Additional Paid- in Capital	Retained Earnings	Statutory Surplus Reserve	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2024				57,938,885	5,021,811
Beginning balance at Dec. 31, 2024	$ 1,095,906			$ 6	$ 1	$ 677,476	$ 260,000	$ 30,514	$ (63,372)	$ 191,281
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	61,283						50,140			11,143
Unrealized gain on available-for-sale investments, net of tax	0
Repurchase of shares held by ACM Shanghai	(6,988)					(4,759)				(2,229)
Foreign currency translation adjustment	5,655								4,591	1,064
Exercise of stock options (in shares)				1,158,086
Exercise of stock options	23,582					15,266				8,316
Stock-based compensation	19,587					16,587				3,000
Capita contribution by non-controlling shareholder/ Sale of ACM Shanghai's shares, net of tax	242									242
ACM Shanghai dividend	(7,578)									(7,578)
Ending balance (in shares) at Jun. 30, 2025				59,096,971	5,021,811
Ending balance at Jun. 30, 2025	1,191,689			$ 6	$ 1	704,570	310,140	30,514	(58,781)	205,239
Beginning balance (in shares) at Mar. 31, 2025				58,832,925	5,021,811
Beginning balance at Mar. 31, 2025	1,155,353			$ 6	$ 1	700,191	280,380	30,514	(61,946)	206,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,270						29,760			6,510
Unrealized gain on available-for-sale investments, net of tax	0
Repurchase of shares held by ACM Shanghai	(6,988)					(4,759)				(2,229)
Foreign currency translation adjustment	3,905								3,165	740
Exercise of stock options (in shares)				264,046
Exercise of stock options	853					853
Stock-based compensation	9,770					8,285				1,485
Capita contribution by non-controlling shareholder/ Sale of ACM Shanghai's shares, net of tax	104									104
ACM Shanghai dividend	(7,578)									(7,578)
Ending balance (in shares) at Jun. 30, 2025				59,096,971	5,021,811
Ending balance at Jun. 30, 2025	1,191,689			$ 6	$ 1	704,570	310,140	30,514	(58,781)	205,239
Beginning balance (in shares) at Dec. 31, 2025		60,590,017	5,021,811	60,590,017	5,021,811
Beginning balance at Dec. 31, 2025	1,930,509			$ 6	$ 1	1,115,504	350,428	34,164	(35,740)	466,146
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	148,485						106,291			42,194
Unrealized gain on available-for-sale investments, net of tax	675								493	182
Proceeds from issuance of ACM Research shares, net of issuance costs (in shares)				2,884,615
Proceeds from issuance of ACM Research shares, net of issuance costs	148,389					148,389
Foreign currency translation adjustment	57,938								42,670	15,268
Exercise of stock options (in shares)				1,146,730
Exercise of stock options	30,778					18,725				12,053
Stock-based compensation	12,204					10,016				2,188
Capita contribution by non-controlling shareholder/ Sale of ACM Shanghai's shares, net of tax	87,913					69,207				18,706
Conversion of Class B common stock to Class A common stock (in shares)				30,003	(30,003)
ACM Shanghai dividend	(11,768)									(11,768)
Ending balance (in shares) at Jun. 30, 2026		64,651,365	4,991,808	64,651,365	4,991,808
Ending balance at Jun. 30, 2026	2,405,123			$ 6	$ 1	1,361,841	456,719	34,164	7,423	544,969
Beginning balance (in shares) at Mar. 31, 2026				61,223,064	4,991,808
Beginning balance at Mar. 31, 2026	2,083,472			$ 6	$ 1	1,194,786	367,735	34,164	(15,182)	501,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,250						88,984			33,266
Unrealized gain on available-for-sale investments, net of tax	675								493	182
Proceeds from issuance of ACM Research shares, net of issuance costs (in shares)				2,884,615
Proceeds from issuance of ACM Research shares, net of issuance costs	148,389					148,389
Foreign currency translation adjustment	30,141								22,112	8,029
Exercise of stock options (in shares)				543,686
Exercise of stock options	25,381					13,328				12,053
Stock-based compensation	6,583					5,338				1,245
ACM Shanghai dividend	(11,768)									(11,768)
Ending balance (in shares) at Jun. 30, 2026		64,651,365	4,991,808	64,651,365	4,991,808
Ending balance at Jun. 30, 2026	$ 2,405,123			$ 6	$ 1	$ 1,361,841	$ 456,719	$ 34,164	$ 7,423	$ 544,969