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Fair Value Measurements - Schedule Of Fair Value Measurements, By Major Security Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 454,378 | $ 502,933
Fair Value Measurements on Recurring Basis |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 46,640 |
Short-term investments | 454,378 | 502,933
Cash equivalents and short-term investments | 501,018 | 702,957
Fair Value Measurements on Recurring Basis | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 46,640 |
Short-term investments | 421,874 | 497,938
Cash equivalents and short-term investments | 468,514 | 697,962
Fair Value Measurements on Recurring Basis | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Short-term investments | 32,504 | 4,995
Cash equivalents and short-term investments | 32,504 | 4,995
Fair Value Measurements on Recurring Basis | Money Market Funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 39,180 | 200,024
Fair Value Measurements on Recurring Basis | Money Market Funds | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 39,180 | 200,024
Fair Value Measurements on Recurring Basis | U.S. Treasury Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 7,460 |
Short-term investments | 421,874 | 497,938
Fair Value Measurements on Recurring Basis | U.S. Treasury Securities | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents | 7,460 |
Short-term investments | 421,874 | 497,938
Fair Value Measurements on Recurring Basis | U S Agency Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash equivalents |  | 4,995
Short-term investments | 32,504 |
Fair Value Measurements on Recurring Basis | U S Agency Bonds | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 32,504 | $ 4,995

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