PROPERTY AND EQUIPMENT - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 33,371	$ 31,276
Less: accumulated depreciation	(12,419)	(10,876)
Property and equipment, net	20,952	20,400
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 16,399	14,442
Office and computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	3 years
Office and computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 10,542	10,503
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	10 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,064	4,054
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	7 years
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,366	$ 2,277
Software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Life (in years)	5 years