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Fair Value Measurements - Fair value to amortized cost (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value Measurements
AMORTIZED COST	$ 790,728	$ 874,422
UNREALIZED LOSSES	(121)	(427)
UNREALIZED GAINS	946	1,341
FAIR VALUE	791,553	875,336
Money market funds
Fair Value Measurements
AMORTIZED COST	85,462	161,328
FAIR VALUE	85,462	161,328
U.S. government bonds
Fair Value Measurements
AMORTIZED COST	383,648	262,316
UNREALIZED LOSSES	(30)	(48)
UNREALIZED GAINS	666	747
FAIR VALUE	384,284	263,015
U.S. government agency bonds
Fair Value Measurements
AMORTIZED COST	44,706	46,890
UNREALIZED LOSSES	(1)	(11)
UNREALIZED GAINS	26	78
FAIR VALUE	44,731	46,957
Corporate debt securities
Fair Value Measurements
AMORTIZED COST	276,912	403,888
UNREALIZED LOSSES	(90)	(368)
UNREALIZED GAINS	254	516
FAIR VALUE	$ 277,076	$ 404,036

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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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