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Investments - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Net Investment Income [Line Items] |  |
Estimated Fair Value | $ 473,831 | $ 329,457
Gross Unrealized Gains | 1 | 84
Gross Unrealized Losses | 0 | 0
Amortized cost | 473,830 | 329,373
U.S. Treasuries—Cash equivalents [Member] |  |
Net Investment Income [Line Items] |  |
Estimated Fair Value | 473,831 | 329,457
Gross Unrealized Gains | 1 | 84
Gross Unrealized Losses | 0 | 0
Amortized cost | $ 473,830 | $ 329,373

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