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Fair Value Measurements, Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortization cost, cash and cash equivalents | $ 933,694 |  | $ 271,073
Amortized cost, cash and cash equivalents and debt securities available-for-sale | 1,001,068 | $ 1,067,608 |
Gross Unrealized Gain | 2 | 0 |
Gross Unrealized Loss | (3) | (11) |
Estimated fair value, cash, cash equivalents and debt securities | 1,001,067 | 1,067,597 |
Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortization cost, cash and cash equivalents | 15,061 | 1,032,500 |
Gross Unrealized Gain | 0 | 0 |
Gross Unrealized Loss | 0 | 0 |
Estimated fair value, cash and cash equivalents | 15,061 | 1,032,500 |
Fixed income bond funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost, debt securities, available-for-sale | 101,115 |  |
Gross Unrealized Gain | 0 |  |
Gross Unrealized Loss | 0 |  |
Estimated fair value, debt securities | 101,115 |  |
U.S. government debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized cost, debt securities, available-for-sale | 884,892 | 35,108 |
Gross Unrealized Gain | 2 | 0 |
Gross Unrealized Loss | (3) | (11) |
Estimated fair value, debt securities | $ 884,891 | $ 35,097 |

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