SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Basic and Diluted Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator [Abstract]
Net income	$ 33,597	$ 16,748	$ 42,560	$ 9,305
Less: Net income attributable to non-controlling interests	6,772	4,512	8,590	2,855
Net income available to common stockholders, basic	26,825	12,236	33,970	6,450
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	(303)	(230)	(395)	(147)
Net income available to common stockholders, diluted	$ 26,522	$ 12,006	$ 33,575	$ 6,303
Weighted average shares outstanding, basic (in shares)	59,898,149	59,177,643	59,817,903	59,003,484
Effect of dilutive securities (in shares)	5,031,489	6,301,034	5,150,997	6,769,489
Weighted average shares outstanding, diluted (in shares)	64,929,638	65,478,677	64,968,900	65,772,973
Net income per common share [Abstract]
Basic (in dollars per share)	$ 0.45	$ 0.21	$ 0.57	$ 0.11
Diluted (in dollars per share)	$ 0.41	$ 0.18	$ 0.52	$ 0.10
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	302,561	146,894	394,756	230,095