Available-for-sale debt securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 816,358	$ 140,240
Money market funds \| Level 1
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	95,644	12,204
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	95,644	12,204
U.S. treasury securities \| Level 1
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	636,953	78,268
Gross Unrealized Gains	10	46
Gross Unrealized Losses	(788)	0
Fair Value	636,175	78,314
U.S. government agency securities \| Level 2
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	83,761	49,767
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(118)	(1)
Fair Value	$ 83,643	$ 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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