Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,307	$ 4,290
Less: Accumulated depreciation and amortization	2,833	2,017
Property and equipment, net	5,474	2,273
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,206	2,441
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	902	893
ROU assets - finance lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	934	934
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17	17
Software development in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,248	$ 5