COST OF REVENUE - Components of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cost of Revenue [Abstract]
Outside fees and services	$ 55,858	$ 55,979
Compensation and benefits	35,396	48,064
Technology and telecommunications	14,196	16,937
Reimbursable expenses	8,273	8,039
Depreciation and amortization	1,691	2,286
Total	$ 115,414	$ 131,305