Investments - Debt Securities Available-For-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Unrealized Losses, Less than 12 Months	$ (152)	$ (348)
Unrealized Losses, 12 Months or Longer	(13)
Fair Value, Less than 12 Months	84,465	129,131
Fair Value, 12 Months or Longer	6,276
Unrealized Losses	(165)	(348)
Fair Value	90,741	129,131
Corporate Debt Securities [Member]
Unrealized Losses, Less than 12 Months	(112)	(271)
Unrealized Losses, 12 Months or Longer	(10)
Fair Value, Less than 12 Months	50,322	72,820
Fair Value, 12 Months or Longer	4,279
Unrealized Losses	(122)	(271)
Fair Value	54,601	72,820
Commercial Paper [Member]
Unrealized Losses, Less than 12 Months	(3)	(31)
Fair Value, Less than 12 Months	6,952	35,589
Unrealized Losses	(3)	(31)
Fair Value	6,952	35,589
US Government and Agency Securities [Member]
Unrealized Losses, Less than 12 Months	(37)	(46)
Unrealized Losses, 12 Months or Longer	(3)
Fair Value, Less than 12 Months	27,191	20,722
Fair Value, 12 Months or Longer	1,997
Unrealized Losses	(40)	(46)
Fair Value	$ 29,188	$ 20,722