COST OF REVENUE - Schedule of Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Cost of Revenue [Abstract]
Outside fees and services	$ 14,057	$ 14,351	$ 29,151	$ 27,254
Compensation and benefits	9,281	13,825	18,982	27,346
Technology and telecommunications	3,865	4,956	7,262	10,188
Reimbursable expenses	2,049	2,609	4,359	4,201
Depreciation and amortization	451	614	906	1,235
Total	$ 29,703	$ 36,355	$ 60,660	$ 70,224