Fair Value Measurements - Fair value to amortized cost (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value Measurements
AMORTIZED COST	$ 1,455,089	$ 1,440,609
GROSS UNREALIZED LOSSES	(2,458)	(17)
GROSS UNREALIZED GAINS	263	1,071
FAIR VALUE	1,452,894	1,441,663
Money market funds
Fair Value Measurements
AMORTIZED COST	310,558	795,089
FAIR VALUE	310,558	795,089
U.S. government bonds
Fair Value Measurements
AMORTIZED COST	676,315	384,571
GROSS UNREALIZED LOSSES	(1,410)	(1)
GROSS UNREALIZED GAINS	218	822
FAIR VALUE	675,123	385,392
U.S. government agency bonds
Fair Value Measurements
AMORTIZED COST	34,701	24,922
GROSS UNREALIZED LOSSES	(102)
GROSS UNREALIZED GAINS		19
FAIR VALUE	34,599	24,941
Corporate debt securities
Fair Value Measurements
AMORTIZED COST	433,515	236,027
GROSS UNREALIZED LOSSES	(946)	(16)
GROSS UNREALIZED GAINS	45	230
FAIR VALUE	$ 432,614	$ 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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