Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale
Amortized cost	$ 340,250	$ 503,290
Gross unrealized gains	56,802	59,197
Gross unrealized losses	(5,615)	(3,893)
Estimated fair value	391,437	558,594
U.S. Government Agencies
Debt Securities, Available-for-sale
Amortized cost	109,368	175,780
Gross unrealized gains	0	89
Gross unrealized losses	(696)	(38)
Estimated fair value	108,672	175,831
Corporate notes/bonds
Debt Securities, Available-for-sale
Amortized cost	101,483	124,249
Gross unrealized gains	0	98
Gross unrealized losses	(514)	(52)
Estimated fair value	100,969	124,295
U.S. Treasuries
Debt Securities, Available-for-sale
Amortized cost	74,505	113,055
Gross unrealized gains	0	137
Gross unrealized losses	(407)	(4)
Estimated fair value	74,098	113,188
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	32,989	74,473
Gross unrealized gains	0	21
Gross unrealized losses	(94)	(8)
Estimated fair value	32,895	74,486
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	21,905	15,733
Gross unrealized gains	56,802	58,852
Gross unrealized losses	(3,904)	(3,791)
Estimated fair value	$ 74,803	$ 70,794

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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