COST OF REVENUE - Schedule of Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cost of Revenue [Abstract]
Compensation and benefits	$ 9,701	$ 13,521
Outside fees and services	15,094	12,903
Technology and telecommunications	3,397	5,232
Reimbursable expenses	2,310	1,592
Depreciation and amortization	455	621
Total	$ 30,957	$ 33,869