Consolidated balance sheet components - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 32,025	$ 32,182
Less accumulated depreciation and amortization	(27,041)	(25,170)
Property and equipment, net	4,984	7,012
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	19,041	19,109
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	7,896	7,820
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	4,678	4,870
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	$ 27	$ 0