Available-for-sale debt securities - Schedule of Amortized Cost and Fair Value of Available-For-Sale Debt Securities by Type of Security (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 798,756	$ 140,240
Money market funds \| Level 1
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	22,582	12,204
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	22,582	12,204
U.S. treasury securities \| Level 1
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	705,197	78,268
Gross Unrealized Gains	2	46
Gross Unrealized Losses	(2,558)	0
Fair Value	702,641	78,314
U.S. government agency securities \| Level 2
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	70,977	49,767
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(495)	(1)
Fair Value	$ 70,482	$ 49,781

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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