Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 20,847	$ 28,094
Less than 12 Months, Unrealized Loss	(383)	(876)
12 Months or Longer, Fair Value	41,121	32,828
12 Months or Longer, Unrealized Loss	(1,942)	(1,961)
Total, Fair Value	61,968	60,922
Total, Unrealized Loss	(2,325)	(2,837)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	11,183	16,500
Less than 12 Months, Unrealized Loss	(233)	(544)
12 Months or Longer, Fair Value	26,804	20,050
12 Months or Longer, Unrealized Loss	(1,210)	(1,159)
Total, Fair Value	37,987	36,550
Total, Unrealized Loss	(1,443)	(1,703)
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	8,107	9,869
Less than 12 Months, Unrealized Loss	(98)	(234)
12 Months or Longer, Fair Value	12,732	11,362
12 Months or Longer, Unrealized Loss	(525)	(584)
Total, Fair Value	20,839	21,231
Total, Unrealized Loss	(623)	(818)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,557	1,725
Less than 12 Months, Unrealized Loss	(52)	(98)
12 Months or Longer, Fair Value	1,585	1,416
12 Months or Longer, Unrealized Loss	(207)	(218)
Total, Fair Value	3,142	3,141
Total, Unrealized Loss	$ (259)	$ (316)