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Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Abstract] |  |
Fair Value | $ 1,333,270 |
Fair value, recurring |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 518,842 | $ 397,616
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (172) | (165)
Fair Value | 518,670 | 397,451
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 1,335,365 | 845,109
Gross Unrealized Gains | 124 | 615
Gross Unrealized Losses | (2,219) | (273)
Fair Value | 1,333,270 | 845,451
Total assets measured at fair value, amortized cost | 1,854,207 | 1,242,725
Total assets measured at fair value, gross unrealized gains | 124 | 615
Total assets measured at fair value, gross unrealized losses | (2,391) | (438)
Total assets measured at fair value, fair value | 1,851,940 | 1,242,902
Fair value, recurring | Cash | Level 1 |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 41,651 | 50,003
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 41,651 | 50,003
Fair value, recurring | Money market funds | Level 1 |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 96,932 | 47,357
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 96,932 | 47,357
Fair value, recurring | U.S. Treasury securities | Level 1 |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 4,964 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 4,964 |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 674,993 | 481,704
Gross Unrealized Gains | 50 | 422
Gross Unrealized Losses | (1,082) | (44)
Fair Value | 673,961 | 482,082
Fair value, recurring | Commercial paper | Level 2 |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 327,252 | 300,256
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (170) | (165)
Fair Value | 327,082 | 300,091
Fair value, recurring | Commercial paper | Level 2 |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 104,229 | 102,435
Gross Unrealized Gains | 0 | 7
Gross Unrealized Losses | (61) | (35)
Fair Value | 104,168 | 102,407
Fair value, recurring | U.S. government agency securities | Level 2 |  |
Cash and Cash Equivalents [Abstract] |  |
Amortized Cost | 48,043 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2) |
Fair Value | 48,041 |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 121,175 | 103,484
Gross Unrealized Gains | 11 | 0
Gross Unrealized Losses | (209) | (152)
Fair Value | 120,977 | 103,332
Fair value, recurring | Corporate debt | Level 2 |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 323,913 | 133,523
Gross Unrealized Gains | 41 | 168
Gross Unrealized Losses | (817) | (42)
Fair Value | 323,137 | 133,649
Fair value, recurring | Asset-backed securities | Level 2 |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 111,055 | 23,963
Gross Unrealized Gains | 22 | 18
Gross Unrealized Losses | (50) | 0
Fair Value | $ 111,027 | $ 23,981

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