Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 22,104	$ 22,603
Less accumulated depreciation	(9,418)	(14,731)
Property and equipment, net	12,686	7,872
Depreciation expense	2,200	1,800	$ 1,700
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	5,989	4,707
Office furniture, fixtures and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 16,115	$ 17,896
Office furniture, fixtures and equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciable life	2 years
Office furniture, fixtures and equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciable life	10 years