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Investments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Accrued interest | $ 20 | $ 100 | $ 20 | $ 100
Interest Income [Member] |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Net realized gains (losses) on sale of investments | $ 2 | $ (10) | $ 10 | $ 800

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