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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 296,518 | $ 373,271
Debt and equity securities, Amortized Cost | 297,369 | 373,475
Debt and equity securities, Unrealized Gains | 32 | 9
Debt and equity securities, Unrealized Losses | (883) | (213)
Debt and equity securities, Estimated Fair Value | 296,518 | 373,271
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 67,568 | 140,287
Debt securities, Unrealized Gains | 0 | 0
Debt securities, Unrealized Losses | (92) | (100)
Debt securities, Estimated Fair Value | 67,476 | 140,187
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 49,502 | 49,512
Debt securities, Unrealized Gains | 0 | 0
Debt securities, Unrealized Losses | (92) | (38)
Debt securities, Estimated Fair Value | 49,410 | 49,474
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 25,869 |
Debt securities, Unrealized Gains | 0 |
Debt securities, Unrealized Losses | (66) |
Debt securities, Estimated Fair Value | 25,803 |
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost |  | 26,006
Debt securities, Unrealized Gains |  | 0
Debt securities, Unrealized Losses |  | (22)
Debt securities, Estimated Fair Value |  | 25,984
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 154,430 | 157,670
Debt securities, Unrealized Gains | 32 | 9
Debt securities, Unrealized Losses | (633) | (53)
Debt securities, Estimated Fair Value | $ 153,829 | $ 157,626

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