Investments - Debt Securities Available-For-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Unrealized Losses, Less than 12 Months	$ (580)	$ (348)
Unrealized Losses,12 Months or Longer	(31)
Fair Value, Less than 12 Months	146,814	129,131
Fair Value, 12 Months or Longer	3,361
Unrealized Losses	(611)	(348)
Fair Value	150,175	129,131
Corporate Debt Securities [Member]
Unrealized Losses, Less than 12 Months	(345)	(271)
Unrealized Losses,12 Months or Longer	(31)
Fair Value, Less than 12 Months	77,264	72,820
Fair Value, 12 Months or Longer	3,361
Unrealized Losses	(376)	(271)
Fair Value	80,625	72,820
Commercial Paper [Member]
Unrealized Losses, Less than 12 Months	(43)	(31)
Fair Value, Less than 12 Months	26,232	35,589
Unrealized Losses	(43)	(31)
Fair Value	26,232	35,589
U.S. government and agency securities [Member]
Unrealized Losses, Less than 12 Months	(192)	(46)
Fair Value, Less than 12 Months	43,318	20,722
Unrealized Losses	(192)	(46)
Fair Value	$ 43,318	$ 20,722