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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, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 301,977 | $ 373,271
Debt and equity securities, Amortized Cost | 302,968 | 373,475
Debt and equity securities, Unrealized Gains | 46 | 9
Debt and equity securities, Unrealized Losses | (1,037) | (213)
Debt and equity securities, Estimated Fair Value | 301,977 | 373,271
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 15,956 | 140,287
Debt securities, Unrealized Gains | 0 | 0
Debt securities, Unrealized Losses | (11) | (100)
Debt securities, Estimated Fair Value | 15,945 | 140,187
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 81,216 | 49,512
Debt securities, Unrealized Gains | 16 | 0
Debt securities, Unrealized Losses | (291) | (38)
Debt securities, Estimated Fair Value | 80,941 | 49,474
Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 20,873 |
Debt securities, Unrealized Gains | 0 |
Debt securities, Unrealized Losses | (98) |
Debt securities, Estimated Fair Value | 20,775 |
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 | 184,923 | 157,670
Debt securities, Unrealized Gains | 30 | 9
Debt securities, Unrealized Losses | (637) | (53)
Debt securities, Estimated Fair Value | $ 184,316 | $ 157,626

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