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Investments - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Net Investment Income [Line Items] |  |
Estimated Fair Value | $ 407,687 | $ 329,457
Gross Unrealized Gains | 41 | 84
Gross Unrealized Losses | 0 | 0
Amortized cost | 407,646 | 329,373
U.S. Treasuries—Cash equivalents [Member] |  |
Net Investment Income [Line Items] |  |
Estimated Fair Value | 407,687 | 329,457
Gross Unrealized Gains | 41 | 84
Gross Unrealized Losses | 0 | 0
Amortized cost | $ 407,646 | $ 329,373

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