Consolidated balance sheet components - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 38,445	$ 34,258
Less accumulated depreciation and amortization	(31,469)	(29,724)
Property and equipment, net	6,976	4,534
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	22,720	19,064
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	9,285	8,317
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	5,947	4,737
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	$ 110	$ 1,757