Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 140,377	$ 123,839
Available-for-sale marketable securities, Unrealized Gain	249	73
Available-for-sale marketable securities, Unrealized (Loss)	(8,170)	(11,041)
Available-for-sale marketable securities, Fair Market Value	132,456	112,871
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	87,538	99,763
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	45,725	44,030
Available-for-sale marketable securities, Unrealized Gain	14	0
Available-for-sale marketable securities, Unrealized (Loss)	(3,931)	(4,381)
Available-for-sale marketable securities, Fair Market Value	41,808	39,649
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	35,080	39,649
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,633	7,089
Available-for-sale marketable securities, Unrealized Gain	34	70
Available-for-sale marketable securities, Unrealized (Loss)	0	0
Available-for-sale marketable securities, Fair Market Value	1,667	7,159
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	0	0
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	56,458	57,006
Available-for-sale marketable securities, Unrealized Gain	201	3
Available-for-sale marketable securities, Unrealized (Loss)	(3,925)	(6,153)
Available-for-sale marketable securities, Fair Market Value	52,734	50,856
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	44,263	50,667
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	9,081	6,997
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	(308)	(417)
Available-for-sale marketable securities, Fair Market Value	8,773	6,580
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,303	3,095
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	4,898	6,442
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	(6)	(90)
Available-for-sale marketable securities, Fair Market Value	4,892	6,352
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	4,892	6,352
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	21,772	1,740
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	0	0
Available-for-sale marketable securities, Fair Market Value	21,772	1,740
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	0	0
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	810	535
Available-for-sale marketable securities, Unrealized Gain	0	0
Available-for-sale marketable securities, Unrealized (Loss)	0	0
Available-for-sale marketable securities, Fair Market Value	810	535
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 0	$ 0