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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, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 250,208 | $ 301,977
Debt and equity securities, Amortized Cost | 250,182 | 302,968
Debt and equity securities, Unrealized Gains | 166 | 46
Debt and equity securities, Unrealized Losses | (140) | (1,037)
Debt and equity securities, Estimated Fair Value | 250,208 | 301,977
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 75,315 | 15,956
Debt securities, Unrealized Gains | 47 | 0
Debt securities, Unrealized Losses | (28) | (11)
Debt securities, Estimated Fair Value | 75,334 | 15,945
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 174,867 | 81,216
Debt securities, Unrealized Gains | 119 | 16
Debt securities, Unrealized Losses | (112) | (291)
Debt securities, Estimated Fair Value | $ 174,874 | 80,941
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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