Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 122,885	$ 140,377
Available-for-sale marketable securities, Unrealized Gain	109	249
Available-for-sale marketable securities, Unrealized (Loss)	(9,018)	(8,170)
Available-for-sale marketable securities, Fair Market Value	113,976	132,456
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	77,541	87,538
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	44,519	45,725
Available-for-sale marketable securities, Unrealized Gain	1	14
Available-for-sale marketable securities, Unrealized (Loss)	(4,452)	(3,931)
Available-for-sale marketable securities, Fair Market Value	40,068	41,808
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	38,914	35,080
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	39,946	56,458
Available-for-sale marketable securities, Unrealized Gain	89	201
Available-for-sale marketable securities, Unrealized (Loss)	(4,190)	(3,925)
Available-for-sale marketable securities, Fair Market Value	35,845	52,734
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	31,461	44,263
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,670	1,633
Available-for-sale marketable securities, Unrealized Gain	19	34
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	1,689	1,667
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	3,883	4,898
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)	(20)	(6)
Available-for-sale marketable securities, Fair Market Value	3,863	4,892
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,863	4,892
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	10,363	9,081
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)	(356)	(308)
Available-for-sale marketable securities, Fair Market Value	10,007	8,773
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,303	3,303
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	21,706	21,772
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	21,706	21,772
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		0
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	798	810
Available-for-sale marketable securities, Unrealized Gain		0
Available-for-sale marketable securities, Unrealized (Loss)		0
Available-for-sale marketable securities, Fair Market Value	798	810
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		$ 0