Certain Balance Sheet Components - Property and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 61,650		$ 61,650		$ 38,916
Accumulated depreciation and amortization	(25,859)		(25,859)		(20,152)
Operating lease right-of-use assets, net	35,791		35,791		18,764
Depreciation and amortization	4,448	$ 3,108	11,941	$ 7,582
Capitalized internal-use software costs	5,600	4,300	20,200	13,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,110		8,110		8,110
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,187		9,187		8,885
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,488		2,488		2,597
Internally developed and purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	41,865		41,865		$ 19,324
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 2,900	$ 1,600	$ 7,500	$ 3,700