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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 373,271 | $ 305,930
Equity securities, Amortized Cost | 373,475 |
Equity securities, Unrealized Gains | 9 |
Equity securities, Unrealized Losses | (213) |
Equity securities, Estimated Fair Value | 373,271 |
Debt and equity securities, Amortized Cost |  | 305,899
Debt and equity securities, Unrealized Gains |  | 74
Debt and equity securities, Unrealized Losses |  | (43)
Debt and equity securities, Estimated Fair Value |  | 305,930
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 140,287 | 205,111
Debt securities, Unrealized Gains | 0 | 6
Debt securities, Unrealized Losses | (100) | (27)
Debt securities, Estimated Fair Value | 140,187 | 205,090
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 49,512 | 10,004
Debt securities, Unrealized Losses | (38) | (5)
Debt securities, Estimated Fair Value | 49,474 | 9,999
Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 26,006 |
Debt securities, Unrealized Losses | (22) |
Debt securities, Estimated Fair Value | 25,984 |
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 | 157,670 | 38,443
Debt securities, Unrealized Gains | 9 | 21
Debt securities, Unrealized Losses | (53) | (11)
Debt securities, Estimated Fair Value | $ 157,626 | $ 38,453

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