Certain Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued costs of revenue	$ 41,339	$ 24,529
Reserve for contract contingencies and processing errors	3,386	9,537
Accrued compensation and benefits	32,954	14,078
Deferred revenue	19,060	3,983
Operating lease liabilities, current portion	3,021	2,771
Accrued professional services	2,454	867
Other accrued liabilities	11,882	4,780
Accrued expenses and other current liabilities	$ 114,096	$ 60,545
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities