XML 42 R33.htm IDEA: XBRL DOCUMENT v3.23.2
Summary of Available-for-Sale Securities (Detail) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 71,675,000 $ 83,828,000  
Gross Unrealized Gain 6,000 50,000  
Gross Unrealized Loss (2,341,000) (2,837,000)  
Allowance for Credit Loss 0 0 $ 0
Fair Value 69,340,000 81,041,000  
Money market funds      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 5,472,000 14,472,000  
Gross Unrealized Gain   0  
Gross Unrealized Loss   0  
Allowance for Credit Loss   0  
Fair Value 5,472,000 14,472,000  
United States government agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 27,159,000 27,200,000  
Gross Unrealized Gain   41,000  
Gross Unrealized Loss (708,000) (818,000)  
Allowance for Credit Loss   0  
Fair Value 26,451,000 26,423,000  
Corporate debt securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 35,541,000 38,496,000  
Gross Unrealized Gain   2,000  
Gross Unrealized Loss (1,333,000) (1,703,000)  
Allowance for Credit Loss   0  
Fair Value 34,208,000 36,795,000  
Mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 3,503,000 3,660,000  
Gross Unrealized Gain 6,000 7,000  
Gross Unrealized Loss (300,000) (316,000)  
Allowance for Credit Loss   0  
Fair Value $ 3,209,000 $ 3,351,000