Fair Value Measurements - Fair value to amortized cost (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value Measurements
AMORTIZED COST	$ 1,340,497	$ 1,440,609
GROSS UNREALIZED LOSSES	(3,501)	(17)
GROSS UNREALIZED GAINS	56	1,071
FAIR VALUE	1,337,052	1,441,663
Money market funds
Fair Value Measurements
AMORTIZED COST	267,032	795,089
FAIR VALUE	267,032	795,089
U.S. government bonds
Fair Value Measurements
AMORTIZED COST	641,154	384,571
GROSS UNREALIZED LOSSES	(2,569)	(1)
GROSS UNREALIZED GAINS	45	822
FAIR VALUE	638,630	385,392
U.S. government agency bonds
Fair Value Measurements
AMORTIZED COST	34,802	24,922
GROSS UNREALIZED LOSSES	(155)
GROSS UNREALIZED GAINS		19
FAIR VALUE	34,647	24,941
Corporate debt securities
Fair Value Measurements
AMORTIZED COST	397,509	236,027
GROSS UNREALIZED LOSSES	(777)	(16)
GROSS UNREALIZED GAINS	11	230
FAIR VALUE	$ 396,743	$ 236,241

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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Amount, before tax, of unrealized loss 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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Amortized cost excluding accrued interest, before allowance for credit loss, of 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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Amount excluding accrued interest, of 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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