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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 445,651 | $ 305,930
Equity securities, Amortized Cost | 445,663 |
Equity securities, Unrealized Gains | 28 |
Equity securities, Unrealized Losses | (40) |
Equity securities, Estimated Fair Value | 445,651 |
Debt and equity securities, Amortized Cost | 445,663 | 305,899
Debt and equity securities, Unrealized Gains | 28 | 74
Debt and equity securities, Unrealized Losses | (40) | (43)
Debt and equity securities, Estimated Fair Value | 445,651 | 305,930
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 179,885 | 205,111
Debt securities, Unrealized Gains | 4 | 6
Debt securities, Unrealized Losses | (11) | (27)
Debt securities, Estimated Fair Value | 179,878 | 205,090
US Government Sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 56,018 | 10,004
Debt securities, Unrealized Losses | (6) | (5)
Debt securities, Estimated Fair Value | 56,012 | 9,999
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 19,129 |
Debt securities, Unrealized Losses | (7) |
Debt securities, Estimated Fair Value | 19,122 |
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost |  | 52,341
Debt securities, Unrealized Gains |  | 47
Debt securities, Estimated Fair Value |  | 52,388
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 190,631 | 38,443
Debt securities, Unrealized Gains | 24 | 21
Debt securities, Unrealized Losses | (16) | (11)
Debt securities, Estimated Fair Value | $ 190,639 | $ 38,453

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