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Fair Value Measurements - Financial Assets Measured at Fair Value on a Recurring Basis by Level Within Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | $ 452,100 | $ 848,631 | $ 963,735
Amortized Cost | 1,711,677 | 2,403,183 |
Gross Unrealized Holding Gains | 29 | 0 |
Gross Unrealized Holding Losses | (1,229) | (8,396) |
Aggregate Fair Value | 1,721,302 | 2,426,679 |
Level 1 | Money market funds |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 470,323 | 909,342 |
Cash and cash equivalents | 470,323 | 909,342 |
Restricted cash equivalents | 20,300 | 19,300 |
Level 1 | Equity securities |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Equity securities | 10,825 | 31,892 |
Level 2 | U.S. government treasuries |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 1,073,982 | 1,493,841 |
Gross Unrealized Holding Gains | 15 | 0 |
Gross Unrealized Holding Losses | (1,009) | (8,396) |
Aggregate Fair Value | 1,072,988 | $ 1,485,445 |
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 | 167,372 |  |
Gross Unrealized Holding Gains | 14 |  |
Gross Unrealized Holding Losses | (220) |  |
Aggregate Fair Value | $ 167,166 |  |

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