COST OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Cost of Revenue [Abstract]
Compensation and benefits	$ 13,825	$ 18,449	$ 27,346	$ 40,484
Outside fees and services	14,351	16,859	27,254	35,582
Technology and telecommunications	4,956	5,994	10,188	12,581
Reimbursable expenses	2,609	1,936	4,201	3,949
Depreciation and amortization	614	799	1,235	1,599
Total	$ 36,355	$ 44,037	$ 70,224	$ 94,195