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Summary of Available-for-Sale Securities (Detail) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 64,208,000 $ 62,260,000  
Gross Unrealized Gain 127,000 107,000  
Gross Unrealized Loss (213,000) (408,000)  
Allowance for Credit Loss 0 0 $ 0
Fair Value 64,122,000 61,959,000  
Money market funds      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,280,000 1,773,000  
Gross Unrealized Gain 0 0  
Gross Unrealized Loss 0 0  
Allowance for Credit Loss 0 0  
Fair Value 1,280,000 1,773,000  
United States government agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 23,871,000 24,060,000  
Gross Unrealized Gain 46,000 54,000  
Gross Unrealized Loss (1,000) (52,000)  
Allowance for Credit Loss 0 0  
Fair Value 23,916,000 24,062,000  
Corporate debt securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 36,200,000 33,357,000  
Gross Unrealized Gain 76,000 53,000  
Gross Unrealized Loss (2,000) (39,000)  
Allowance for Credit Loss 0 0  
Fair Value 36,274,000 33,371,000  
Mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 2,857,000 3,070,000  
Gross Unrealized Gain 5,000 0  
Gross Unrealized Loss (210,000) (317,000)  
Allowance for Credit Loss 0 0  
Fair Value $ 2,652,000 $ 2,753,000