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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 10,753 $ 28,094
Less than 12 Months, Unrealized Loss (175) (876)
12 Months or Longer, Fair Value 50,864 32,828
12 Months or Longer, Unrealized Loss (1,949) (1,961)
Total, Fair Value 61,617 60,922
Total, Unrealized Loss (2,124) (2,837)
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 2,075 16,500
Less than 12 Months, Unrealized Loss (39) (544)
12 Months or Longer, Fair Value 30,879 20,050
12 Months or Longer, Unrealized Loss (1,050) (1,159)
Total, Fair Value 32,954 36,550
Total, Unrealized Loss (1,089) (1,703)
United States government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 8,253 9,869
Less than 12 Months, Unrealized Loss (115) (234)
12 Months or Longer, Fair Value 17,430 11,362
12 Months or Longer, Unrealized Loss (471) (584)
Total, Fair Value 25,683 21,231
Total, Unrealized Loss (586) (818)
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 425 1,725
Less than 12 Months, Unrealized Loss (21) (98)
12 Months or Longer, Fair Value 2,555 1,416
12 Months or Longer, Unrealized Loss (428) (218)
Total, Fair Value 2,980 3,141
Total, Unrealized Loss $ (449) $ (316)