SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Cash and Cash Equivalents

The following table presents cash and cash equivalents, according to jurisdiction as of December 31, 2025 and 2024:

	December 31,
	2025		2024
United States	$	107,184	$	56,308
Mainland China	228,777		94,701
China Hong Kong	421,104		255,853
South Korea	241		516
Singapore	67		67
Total	$	757,373	$	407,445

Estimated Useful Lives of Property, Plant and Equipment

Estimated useful lives of assets are as follows:

Buildings and plants	30 years
Computer and office equipment	3 to 5 years
Furniture and fixtures	5 years
Leasehold improvements	shorter of lease term or estimated useful life
Electronic equipment	3 to 5 years
Manufacturing equipment	5 to 10 years
Transportation equipment	4 to 5 years

Warranty Obligations

The following table shows changes in the Company’s warranty obligations for the years ended December 31, 2025, 2024 and 2023, respectively.

	Year Ended December 31,
	2025		2024		2023
Balance at beginning of period	$	12,710	$	9,834	$	8,780
Additions	13,550		11,460		7,969
Utilized	(7,156)		(8,584)		(6,915)
Balance at end of period	$	19,104	$	12,710	$	9,834

Basic and Diluted Net Income per Common Share

Basic and diluted net income per share of common stock is calculated as follows:

	Year Ended December 31,
	2025		2024		2023
Numerator:
Net income	$	121,893	$	131,269	$	96,852
Less: Net income attributable to non-controlling interests	27,815		27,642		19,503
Net income available to common stockholders, basic	94,078		103,627		77,349
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	1,929		2,227		1,841
Net income available to common stockholders, diluted	$	92,149	$	101,400	$	75,508
Weighted average shares outstanding, basic	64,184,776		62,212,569		60,164,670
Effect of dilutive securities	3,127,117		4,024,855		4,705,873
Weighted average shares outstanding, diluted	67,311,893		66,237,424		64,870,543
Net income per share of common stock:
Basic	$	1.47	$	1.67	$	1.29
Diluted	$	1.37	$	1.53	$	1.16

Carrying Value of Borrowings

Assets and liabilities measured at fair value on a recurring basis:

	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of December 31, 2025
Assets
Cash and cash equivalents	$	84,627	$	—	$	—	$	84,627
Short-term investments	35,524		—		—		35,524
Available-for-sale debt securities	—		—		9,703		9,703
	$	120,151	$	—	$	9,703	$	129,854
As of December 31, 2024
Assets
Cash and cash equivalents	$	50,967	$	—	$	—	$	50,967
Short-term investments	19,373		—		—		19,373
Available-for-sale debt securities	—		—		5,366		5,366
	$	70,340	$	—	$	5,366	$	75,706