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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Investments, Fair Value | $ 889,114 |
Fair Value, Recurring |  |
Assets: |  |
Cash and cash equivalents, Amortized Cost | 545,292 | $ 834,691
Cash and cash equivalents, Gross Unrealized Gains | 0 |
Cash and cash equivalents, Gross Unrealized Losses | (158) | (34)
Cash and cash equivalents, Fair Value | 545,134 | 834,657
Investments, Amortized Cost | 891,246 | 123,595
Investments, Gross Unrealized Gains | 1 | 39
Investments, Gross Unrealized Losses | (2,133) | (366)
Investments, Fair Value | 889,114 | 123,268
Total assets measured at fair value, Amortized Cost | 1,436,538 | 958,286
Total assets measured at fair value, Gross Unrealized Gains | 1 | 39
Total assets measured at fair value, Gross Unrealized Losses | (2,291) | (400)
Total assets measured at fair value, Fair Value | 1,434,248 | 957,925
Fair Value, Recurring | Cash | Level 1 |  |
Assets: |  |
Cash and cash equivalents, Amortized Cost | 58,838 | 56,198
Cash and cash equivalents, Fair Value | 58,838 | 56,198
Fair Value, Recurring | Money Market Funds | Level 1 |  |
Assets: |  |
Cash and cash equivalents, Amortized Cost | 49,321 | 680,934
Cash and cash equivalents, Fair Value | 49,321 | 680,934
Fair Value, Recurring | Commercial Paper | Level 2 |  |
Assets: |  |
Cash and cash equivalents, Amortized Cost | 437,133 | 92,581
Cash and cash equivalents, Gross Unrealized Losses | (158) | (34)
Cash and cash equivalents, Fair Value | 436,975 | 92,547
Fair Value, Recurring | U.S. Treasury Securities | Level 1 |  |
Assets: |  |
Investments, Amortized Cost | 498,495 | 37,651
Investments, Gross Unrealized Gains | 0 |
Investments, Gross Unrealized Losses | (1,012) | (70)
Investments, Fair Value | 497,483 | 37,581
Fair Value, Recurring | Commercial Paper | Level 2 |  |
Assets: |  |
Investments, Amortized Cost | 137,780 | 28,161
Investments, Gross Unrealized Losses | (12) | (17)
Investments, Fair Value | 137,768 | 28,144
Fair Value, Recurring | Corporate Debt | Level 2 |  |
Assets: |  |
Investments, Amortized Cost | 126,820 | 25,402
Investments, Gross Unrealized Gains | 0 |
Investments, Gross Unrealized Losses | (342) | (131)
Investments, Fair Value | 126,478 | 25,271
Fair Value, Recurring | Asset-backed Securities | Level 2 |  |
Assets: |  |
Investments, Amortized Cost | 24,655 | 6,954
Investments, Gross Unrealized Gains |  | 20
Investments, Gross Unrealized Losses | (53) |
Investments, Fair Value | 24,602 | 6,974
Fair Value, Recurring | U.S. Government Agency Securities | Level 2 |  |
Assets: |  |
Cash and cash equivalents, Amortized Cost |  | 4,978
Cash and cash equivalents, Fair Value |  | 4,978
Investments, Amortized Cost | 103,496 | 25,427
Investments, Gross Unrealized Gains | 1 | 19
Investments, Gross Unrealized Losses | (714) | (148)
Investments, Fair Value | $ 102,783 | $ 25,298

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