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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 111,978 | $ 301,977
Debt and equity securities, Amortized Cost | 112,212 | 302,968
Debt and equity securities, Unrealized Gains | 27 | 46
Debt and equity securities, Unrealized Losses | (261) | (1,037)
Debt and equity securities, Estimated Fair Value | 111,978 | 301,977
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost |  | 15,956
Debt securities, Unrealized Gains |  | 0
Debt securities, Unrealized Losses |  | (11)
Debt securities, Estimated Fair Value |  | 15,945
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 104,852 | 81,216
Debt securities, Unrealized Gains | 27 | 16
Debt securities, Unrealized Losses | (231) | (291)
Debt securities, Estimated Fair Value | 104,648 | 80,941
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 7,360 |
Debt securities, Unrealized Gains | 0 |
Debt securities, Unrealized Losses | (30) |
Debt securities, Estimated Fair Value | $ 7,330 |
Corporate debt securities |  |
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
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost |  | 184,923
Debt securities, Unrealized Gains |  | 30
Debt securities, Unrealized Losses |  | (637)
Debt securities, Estimated Fair Value |  | $ 184,316

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