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Fair Value Measurements - Fair Value Measurements of Cash Equivalents, Available-For-Sale Investment Securities and Equity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 744,867 | $ 587,959
Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 155,844 | 151,555
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 563,051 | 397,458
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 155,844 | 151,555
Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 181,816 | 190,501
U.S. Treasury notes |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 407,207 | 245,903
U.S. Treasury notes | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 407,207 | 245,903
Government Sponsored Enterprises Securities [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 181,816 | 190,501
Government Sponsored Enterprises Securities [Member] | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 181,816 | $ 190,501

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