Consolidated balance sheet components - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 08, 2025 USD ($)	Sep. 30, 2025 USD ($) security	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) security	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) security	Aug. 24, 2021 USD ($)
Intangible Asset, Acquired, Finite-Lived [Line Items]
Realized gains and losses reclassified from accumulated other comprehensive loss to other income (expense), net		$ 0	$ 0	$ 0	$ 0
Number of continuous unrealized loss position for twelve months or longer | security		0		0		0
Depreciation		$ 800	700	$ 2,400	2,200
Amortization expense of capitalized software		5,000	5,000	15,900	14,800
Amortization expense of intangible assets		400	$ 700	1,100	$ 2,600
Goodwill		$ 12,646		$ 12,646		$ 12,646
CorpU
Intangible Asset, Acquired, Finite-Lived [Line Items]
Goodwill							$ 12,600
Assembled workforce
Intangible Asset, Acquired, Finite-Lived [Line Items]
Intangible assets, net and goodwill	$ 1,500