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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 123,839	$ 334,077
Available-for-sale marketable securities, Unrealized Gain	73	5,477
Available-for-sale marketable securities, Unrealized (Loss)	(11,041)	(718)
Available-for-sale marketable securities, Fair Market Value	112,871	338,836
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	99,763	91,937
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	44,030	77,707
Available-for-sale marketable securities, Unrealized Gain		551
Available-for-sale marketable securities, Unrealized (Loss)	(4,381)	(470)
Available-for-sale marketable securities, Fair Market Value	39,649	77,789
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	39,649	46,435
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	7,089	189,614
Available-for-sale marketable securities, Unrealized Gain	70	15
Available-for-sale marketable securities, Unrealized (Loss)		(9)
Available-for-sale marketable securities, Fair Market Value	7,159	189,620
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses		22,784
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	57,006	52,266
Available-for-sale marketable securities, Unrealized Gain	3	4,863
Available-for-sale marketable securities, Unrealized (Loss)	(6,153)	(227)
Available-for-sale marketable securities, Fair Market Value	50,856	56,901
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	50,667	19,422
Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	6,997	7,928
Available-for-sale marketable securities, Unrealized Gain		43
Available-for-sale marketable securities, Unrealized (Loss)	(417)
Available-for-sale marketable securities, Fair Market Value	6,580	7,971
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	3,095
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	6,442	4,617
Available-for-sale marketable securities, Unrealized Gain		5
Available-for-sale marketable securities, Unrealized (Loss)	(90)	(12)
Available-for-sale marketable securities, Fair Market Value	6,352	4,610
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	6,352	3,296
Certificates of Deposit and Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	1,740	1,356
Available-for-sale marketable securities, Fair Market Value	1,740	1,356
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	535	589
Available-for-sale marketable securities, Fair Market Value	$ 535	$ 589

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