Balance Sheet Components - Components of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 56,167	$ 55,645
Less: Accumulated depreciation and amortization	(52,743)	(52,023)
Property and equipment, net	3,424	3,622	[1]
Software, Including Internally Developed Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 31,731	31,220
Estimated useful life	3 years
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 14,970	14,967
Computer Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	3 years
Computer Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	4 years
Finance Lease Right-of-Use Assets [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3,714	3,714
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,138	4,138
Office Equipment, Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,614	$ 1,606
Office Equipment, Furniture and Fixtures [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	3 years
Office Equipment, Furniture and Fixtures [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	5 years

[1] Derived from the Company’s audited consolidated financial statements as of December 31, 2021.