Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Aggregate Fair Value	$ 170,084	$ 222,947	$ 168,350
Gross Unrealized Holding Gains	1,146	1,488
Gross Unrealized Holding Losses	(67)	(71)
Equity securities	8,700
Amortized Cost	791,466	1,077,353
Aggregate Fair Value	801,224	1,083,120
Reconciliation to cash, cash equivalents and investments on condensed consolidated balance sheet
Minus: Restricted cash equivalents invested in money market funds	(9,200)
Plus: Cash deposits	17,710	32,524
Total cash, cash equivalents and investments	810,725	1,095,363
Money market funds
Reconciliation to cash, cash equivalents and investments on condensed consolidated balance sheet
Minus: Restricted cash equivalents invested in money market funds	(8,209)	(20,281)
Level 1 | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	124,911	146,505
Aggregate Fair Value	124,911	146,505
Level 1 | Equity securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	8,679	4,350
Level 2 | U.S. government treasuries
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	380,900	588,794
Gross Unrealized Holding Gains	233	722
Gross Unrealized Holding Losses	(52)	(33)
Aggregate Fair Value	381,081	589,483
Level 2 | U.S. government agency bonds and discount notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	31,996	38,081
Gross Unrealized Holding Gains	8	17
Gross Unrealized Holding Losses	(15)	(19)
Aggregate Fair Value	31,989	38,079
Level 2 | Asset-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	85,151	51,038
Gross Unrealized Holding Gains	340	220
Gross Unrealized Holding Losses	0	(10)
Aggregate Fair Value	85,491	51,248
Level 2 | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	168,508	252,935
Gross Unrealized Holding Gains	565	529
Gross Unrealized Holding Losses	0	(9)
Aggregate Fair Value	$ 169,073	$ 253,455