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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 267,437 | $ 301,977
Debt and equity securities, Amortized Cost | 267,989 | 302,968
Debt and equity securities, Unrealized Gains | 5 | 46
Debt and equity securities, Unrealized Losses | 557 | (1,037)
Debt and equity securities, Estimated Fair Value | 267,437 | 301,977
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 38,752 | 15,956
Debt securities, Unrealized Gains | 3 | 0
Debt securities, Unrealized Losses | (82) | (11)
Debt securities, Estimated Fair Value | 38,673 | 15,945
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 221,852 | 81,216
Debt securities, Unrealized Gains | 2 | 16
Debt securities, Unrealized Losses | (473) | (291)
Debt securities, Estimated Fair Value | 221,381 | 80,941
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 7,385 |
Debt securities, Unrealized Gains | 0 |
Debt securities, Unrealized Losses | (2) |
Debt securities, Estimated Fair Value | $ 7,383 |
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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