Certain Balance Sheet Components - Property and Equipment, net (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 35,556,000		$ 35,556,000		$ 22,849,000
Accumulated depreciation and amortization	(18,534,000)		(18,534,000)		(15,409,000)
Property and equipment, net	17,022,000		17,022,000		7,440,000
Depreciation and amortization	3,108,000	$ 934,000	7,582,000	$ 2,834,000
Capitalized internal-use software costs	4,300,000	0	13,000,000	$ 0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,110,000		8,110,000		8,110,000
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,832,000		8,832,000		9,115,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,519,000		2,519,000		2,542,000
Internally developed and purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,095,000		16,095,000		$ 3,082,000
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 1,600,000	$ 900,000	$ 3,700,000