Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Depreciation	$ 2,300	$ 1,800	$ 6,700	$ 5,600
Property and equipment, net	29,419		29,419		$ 22,116
Accumulated amortization	21,848		21,848		15,805
Financed Under Capital Leases
Property Plant And Equipment [Line Items]
Property and equipment, net	4,200		4,200		4,600
Accumulated amortization	$ 2,300		$ 2,300		$ 1,800