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Investments - Schedule of Contractual Maturities of Held to Maturity Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Held-to-Maturity, Maturity [Abstract] |  |  |
Amortized cost basis, due in one year or less | [1] | $ 230,797 | $ 115,263
Amortized cost basis due after one year through five years |  | 16,796 | 7,155
Amortized cost basis, total |  | 247,593 | 122,418
Aggregate fair value, due in one year or less | [1] | 231,555 | 115,374
Aggregate fair value, due after one year through five years |  | 16,992 | 7,197
Aggregate fair value, total |  | $ 248,547 | $ 122,571
[1] | The investments due in one year or less include cash equivalents of $41.6 million as of September 30, 2024 and $58.6 million as of December 31, 2023.

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