Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 63,897	$ 48,631
Less than 12 Months, Unrealized Loss	(1,645)	(250)
12 Months or Longer, Fair Value	0	2,017
12 Months or Longer, Unrealized Loss	0	(5)
Total, Fair Value	63,897	50,648
Total, Unrealized Loss	(1,645)	(255)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	41,507	27,909
Less than 12 Months, Unrealized Loss	(1,039)	(153)
12 Months or Longer, Fair Value	0	998
12 Months or Longer, Unrealized Loss	0	(3)
Total, Fair Value	41,507	28,907
Total, Unrealized Loss	(1,039)	(156)
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	20,251	18,367
Less than 12 Months, Unrealized Loss	(506)	(75)
12 Months or Longer, Fair Value	0	1,019
12 Months or Longer, Unrealized Loss	0	(2)
Total, Fair Value	20,251	19,386
Total, Unrealized Loss	(506)	(77)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	2,139	2,355
Less than 12 Months, Unrealized Loss	(100)	(22)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Loss	0	0
Total, Fair Value	2,139	2,355
Total, Unrealized Loss	$ (100)	$ (22)