Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total	$ 27,729	$ 18,672
Accumulated depreciation	(16,275)	(12,422)
Property and equipment, net	11,454	6,250
Depreciation expense	2,100	2,300	$ 1,800
Office equipment and software
Property, Plant and Equipment [Line Items]
Total	14,595	11,059
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total	9,417	4,784
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	$ 3,717	$ 2,829