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Summary of Available-for-Sale Securities (Detail) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 67,911,000 $ 83,828,000  
Gross Unrealized Gain 0 50,000  
Gross Unrealized Loss (2,124,000) (2,837,000)  
Allowance for Credit Loss 0 0 $ 0
Fair Value 65,787,000 81,041,000  
Money market funds      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 4,170,000 14,472,000  
Gross Unrealized Gain 0 0  
Gross Unrealized Loss 0 0  
Allowance for Credit Loss 0 0  
Fair Value 4,170,000 14,472,000  
United States government agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 26,270,000 27,200,000  
Gross Unrealized Gain 0 41,000  
Gross Unrealized Loss (587,000) (818,000)  
Allowance for Credit Loss 0 0  
Fair Value 25,683,000 26,423,000  
Corporate debt securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 34,043,000 38,496,000  
Gross Unrealized Gain 0 2,000  
Gross Unrealized Loss (1,089,000) (1,703,000)  
Allowance for Credit Loss 0 0  
Fair Value 32,954,000 36,795,000  
Mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 3,428,000 3,660,000  
Gross Unrealized Gain 0 7,000  
Gross Unrealized Loss (448,000) (316,000)  
Allowance for Credit Loss   0  
Fair Value $ 2,980,000 $ 3,351,000