Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Aggregate Fair Value	$ 222,947	$ 241,576	$ 848,631
Gross Unrealized Holding Gains	1,488	1,044
Gross Unrealized Holding Losses	(71)	(130)
Equity securities	4,400
Amortized Cost	1,077,353	1,621,500
Aggregate Fair Value	1,083,120	1,632,267
Reconciliation to cash, cash equivalents and investments on consolidated balance sheet
Minus: Restricted cash equivalents invested in money market funds	(95,700)
Plus: Cash deposits	32,524	15,133
Total cash, cash equivalents and investments	1,095,363	1,627,684
Money market funds
Reconciliation to cash, cash equivalents and investments on consolidated balance sheet
Minus: Restricted cash equivalents invested in money market funds	(20,281)	(19,716)
Level 1 | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	146,505	278,187
Aggregate Fair Value	146,505	278,187
Level 1 | Equity securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	4,350	9,853
Level 2 | U.S. government treasuries
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	588,794	1,162,124
Gross Unrealized Holding Gains	722	1,017
Gross Unrealized Holding Losses	(33)	(80)
Aggregate Fair Value	589,483	1,163,061
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	38,081	181,189
Gross Unrealized Holding Gains	17	27
Gross Unrealized Holding Losses	(19)	(50)
Aggregate Fair Value	38,079	$ 181,166
Level 2 | Asset-back securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	51,038
Gross Unrealized Holding Gains	220
Gross Unrealized Holding Losses	(10)
Aggregate Fair Value	51,248
Level 2 | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	252,935
Gross Unrealized Holding Gains	529
Gross Unrealized Holding Losses	(9)
Aggregate Fair Value	$ 253,455