Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total	$ 28,051		$ 27,960
Accumulated depreciation	(16,329)		(16,125)
Property and equipment, net	11,722		11,835
Depreciation expense	700	$ 700
Office equipment and software
Property, Plant and Equipment [Line Items]
Total	13,788		13,540
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total	10,388		10,593
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	$ 3,875		$ 3,827