Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation	$ 13,317	$ 8,983
Acquisition-related liabilities	800	1,942
Accrued third-party cloud infrastructure expenses	2,357	1,572
Accrued reseller commissions	5,623	3,999
Accrued advertising and marketing expenses	7,982	2,412
Advanced payments from customers	2,716	2,815
Accrued taxes	16,311	8,645
Other accrued expenses	5,040	5,240
Accrued liabilities	$ 54,146	$ 35,608