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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale
Amortized cost	$ 492,071	$ 151,619
Gross unrealized gains	36,904	38,865
Gross unrealized losses	(3,829)	(6,626)
Estimated fair value	525,146	183,858
Corporate notes/bonds
Debt Securities, Available-for-sale
Amortized cost	134,162	15,496
Gross unrealized gains	71	21
Gross unrealized losses	(91)	(8)
Estimated fair value	134,142	15,509
U.S. Treasuries
Debt Securities, Available-for-sale
Amortized cost	121,248	78,442
Gross unrealized gains	61	19
Gross unrealized losses	(18)	(13)
Estimated fair value	121,291	78,448
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	118,371	23,483
Gross unrealized gains	30	5
Gross unrealized losses	(29)	(6)
Estimated fair value	118,372	23,482
U.S. Government Agencies
Debt Securities, Available-for-sale
Amortized cost	98,714
Gross unrealized gains	56
Gross unrealized losses	(34)
Estimated fair value	98,736
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	15,056	11,386
Gross unrealized gains	36,686	38,808
Gross unrealized losses	(3,657)	(6,595)
Estimated fair value	48,085	43,599
Certificates of Deposit
Debt Securities, Available-for-sale
Amortized cost	4,520	22,812
Gross unrealized gains	0	12
Gross unrealized losses	0	(4)
Estimated fair value	$ 4,520	$ 22,820

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