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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Marketable securities | $ 799,065 | $ 384,518
Fair Value Recurring [Member] |  |
Assets: |  |
Cash equivalents | 332,707 | 327,055
Total assets | 1,131,772 | 711,573
Fair Value Recurring [Member] | Related Party Revenue Share Liability [Member] |  |
Liabilities: |  |
Total liabilities | 16,600 |
Fair Value Recurring [Member] | Commercial Paper [Member] |  |
Assets: |  |
Marketable securities | 191,882 | 67,080
Fair Value Recurring [Member] | Corporate bonds [Member] |  |
Assets: |  |
Marketable securities | 409,841 | 193,949
Fair Value Recurring [Member] | Government and agency securities [Member] |  |
Assets: |  |
Marketable securities | 120,444 | 89,027
Fair Value Recurring [Member] | U.S. treasury bills [Member] |  |
Assets: |  |
Marketable securities | 76,898 | 34,462
Fair Value Recurring [Member] | Fair value, inputs, level 1 [Member] |  |
Assets: |  |
Cash equivalents | 332,707 | 327,055
Total assets | 332,707 | 327,055
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] |  |
Assets: |  |
Total assets | 799,065 | 384,518
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Commercial Paper [Member] |  |
Assets: |  |
Marketable securities | 191,882 | 67,080
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Corporate bonds [Member] |  |
Assets: |  |
Marketable securities | 409,841 | 193,949
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Government and agency securities [Member] |  |
Assets: |  |
Marketable securities | 120,444 | 89,027
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | U.S. treasury bills [Member] |  |
Assets: |  |
Marketable securities | 76,898 | $ 34,462
Fair Value Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party Revenue Share Liability [Member] |  |
Liabilities: |  |
Total liabilities | $ 16,600 |

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