Leases - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 6,293	$ 7,476	$ 8,540
Cost of revenue
Lessee, Lease, Description [Line Items]
Total operating lease costs	62	489	740
Sales and marketing
Lessee, Lease, Description [Line Items]
Total operating lease costs	1,356	1,680	1,741
Technology and development
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,082	2,420	2,462
General and administrative
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 2,793	$ 2,887	$ 3,597