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Investments - Debt Securities Available-For-Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Unrealized Losses, Less than 12 Months $ (425) $ (348)
Unrealized Losses,12 Months or Longer (18)  
Fair Value, Less than 12 Months 152,062 129,131
Fair Value, 12 Months or Longer 3,787  
Unrealized Losses (443) (348)
Fair Value 155,849 129,131
Corporate Debt Securities [Member]    
Unrealized Losses, Less than 12 Months (279) (271)
Unrealized Losses,12 Months or Longer (14)  
Fair Value, Less than 12 Months 74,056 72,820
Fair Value, 12 Months or Longer 2,092  
Unrealized Losses (293) (271)
Fair Value 76,148 72,820
Commercial Paper [Member]    
Unrealized Losses, Less than 12 Months (27) (31)
Fair Value, Less than 12 Months 25,968 35,589
Unrealized Losses (27) (31)
Fair Value 25,968 35,589
U.S. government and agency securities [Member]    
Unrealized Losses, Less than 12 Months (119) (46)
Unrealized Losses,12 Months or Longer (4)  
Fair Value, Less than 12 Months 52,038 20,722
Fair Value, 12 Months or Longer 1,695  
Unrealized Losses (123) (46)
Fair Value $ 53,733 $ 20,722