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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, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | $ 2,364,039 |  | $ 764,540 |
Financial Assets, Gross Unrealized Holding Gains | 0 |  | 0 |
Financial Assets, Gross Unrealized Holding Losses | (11,626) |  | (872) |
Financial Assets, Aggregate Fair Value | 2,352,413 |  | 763,668 |
Level 1 | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | 978,367 | [1] | 345,098 | [2]
Financial Assets, Gross Unrealized Holding Gains | 0 | [1] | 0 | [2]
Financial Assets, Gross Unrealized Holding Losses | 0 | [1] | 0 | [2]
Financial Assets, Aggregate Fair Value | 978,367 | [1] | 345,098 | [2]
Level 2 | U.S. Government Treasuries |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | 1,385,672 |  | 419,442 |
Financial Assets, Gross Unrealized Holding Gains | 0 |  | 0 |
Financial Assets, Gross Unrealized Holding Losses | (11,626) |  | (872) |
Financial Assets, Aggregate Fair Value | $ 1,374,046 |  | $ 418,570 |
[1] | Includes $21.7 million of restricted cash equivalents.
[2] | Includes $15.6 million of restricted cash equivalents.

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