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Investments - Summary of Available-for-Sale Securities (Detail) - Failed Auction Security [Member] - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Cost $ 3,000,000 $ 3,000,000
Gross Unrealized Losses 359,000 470,000
Estimated Fair Value $ 2,641,000 $ 2,530,000