Consolidated balance sheet components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 32,507	$ 31,922
Less accumulated depreciation and amortization	(29,187)	(27,483)
Property and equipment, net	3,320	4,439
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	19,064	19,064
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	8,180	7,770
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	4,720	4,705
Purchased software
Property, Plant and Equipment [Line Items]
Total property and equipment	383	383
Construction in Progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 160	$ 0