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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 334,077 | $ 601,976
Available-for-sale marketable securities, Unrealized Gain | 5,477 | 9,077
Available-for-sale marketable securities, Unrealized (Loss) | (718) | (213)
Available-for-sale marketable securities, Fair Market Value | 338,836 | 610,840
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 91,937 | 70,418
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 77,707 | 257,132
Available-for-sale marketable securities, Unrealized Gain | 551 | 1,330
Available-for-sale marketable securities, Unrealized (Loss) | (470) | (158)
Available-for-sale marketable securities, Fair Market Value | 77,789 | 258,304
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 46,435 | 17,243
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 189,614 | 254,404
Available-for-sale marketable securities, Unrealized Gain | 15 | 10
Available-for-sale marketable securities, Unrealized (Loss) | (9) | (1)
Available-for-sale marketable securities, Fair Market Value | 189,620 | 254,413
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 22,784 | 12,173
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 52,266 | 76,129
Available-for-sale marketable securities, Unrealized Gain | 4,863 | 7,539
Available-for-sale marketable securities, Unrealized (Loss) | (227) | (53)
Available-for-sale marketable securities, Fair Market Value | 56,901 | 83,615
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 19,422 | 39,896
Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 7,928 | 8,413
Available-for-sale marketable securities, Unrealized Gain | 43 | 152
Available-for-sale marketable securities, Fair Market Value | 7,971 | 8,565
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 4,617 | 4,294
Available-for-sale marketable securities, Unrealized Gain | 5 | 46
Available-for-sale marketable securities, Unrealized (Loss) | (12) | (1)
Available-for-sale marketable securities, Fair Market Value | 4,610 | 4,339
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 3,296 | 1,106
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 1,356 | 979
Available-for-sale marketable securities, Fair Market Value | 1,356 | 979
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 589 | 625
Available-for-sale marketable securities, Fair Market Value | $ 589 | $ 625

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