Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 72,956	$ 48,631
Less than 12 Months, Unrealized Loss	(2,992)	(250)
12 Months or Longer, Fair Value	1,996	2,017
12 Months or Longer, Unrealized Loss	(196)	(5)
Total, Fair Value	74,952	50,648
Total, Unrealized Loss	(3,188)	(255)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	42,349	27,909
Less than 12 Months, Unrealized Loss	(1,739)	(153)
12 Months or Longer, Fair Value	1,996	998
12 Months or Longer, Unrealized Loss	(196)	(3)
Total, Fair Value	44,345	28,907
Total, Unrealized Loss	(1,935)	(156)
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	27,413	18,367
Less than 12 Months, Unrealized Loss	(895)	(75)
12 Months or Longer, Fair Value	0	1,019
12 Months or Longer, Unrealized Loss	0	(2)
Total, Fair Value	27,413	19,386
Total, Unrealized Loss	(895)	(77)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	3,194	2,355
Less than 12 Months, Unrealized Loss	(358)	(22)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Loss	0	0
Total, Fair Value	3,194	2,355
Total, Unrealized Loss	$ (358)	$ (22)