COST OF REVENUE - Components of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cost of Revenue [Abstract]
Compensation and benefits	$ 48,064	$ 69,990
Outside fees and services	55,979	66,386
Technology and telecommunications	16,937	25,273
Reimbursable expenses	8,039	6,555
Depreciation and amortization	2,286	3,162
Total	$ 131,305	$ 171,366