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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