Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale
Amortized cost	$ 291,586	$ 503,290
Gross unrealized gains	63,477	59,197
Gross unrealized losses	(4,007)	(3,893)
Estimated fair value	351,056	558,594
U.S. Government Agencies
Debt Securities, Available-for-sale
Amortized cost	145,569	175,780
Gross unrealized gains	0	89
Gross unrealized losses	(393)	(38)
Estimated fair value	145,176	175,831
U.S. Treasuries
Debt Securities, Available-for-sale
Amortized cost	65,430	113,055
Gross unrealized gains	0	137
Gross unrealized losses	(164)	(4)
Estimated fair value	65,266	113,188
Corporate notes/bonds
Debt Securities, Available-for-sale
Amortized cost	52,307	124,249
Gross unrealized gains	0	98
Gross unrealized losses	(130)	(52)
Estimated fair value	52,177	124,295
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	20,850	15,733
Gross unrealized gains	63,477	58,852
Gross unrealized losses	(3,314)	(3,791)
Estimated fair value	81,013	70,794
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	7,430	74,473
Gross unrealized gains	0	21
Gross unrealized losses	(6)	(8)
Estimated fair value	$ 7,424	$ 74,486

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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