Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 14,215	$ 10,499
Less accumulated depreciation and amortization		(7,931)	(5,849)
Property and equipment, net		6,284	4,650
Furniture and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 1,785	1,189
Property and equipment, useful life in years		5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 4,074	2,776
Property and equipment, useful life in years	[1]	5 years
Systems Hardware
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 1,596	1,404
Property and equipment, useful life in years		5 years
Office Computers
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 5,309	3,745
Property and equipment, useful life in years		3 years
Computer and System Software
Property Plant And Equipment [Line Items]
Property and equipment, gross		$ 1,451	$ 1,385
Property and equipment, useful life in years		3 years

[1] Lesser of the lease term or the estimated useful lives of the improvements, which generally may be up to 5 years.