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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, 2024 | Dec. 31, 2023
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 265,775 | $ 250,208
Debt and equity securities, Amortized Cost | 266,007 | 250,182
Debt and equity securities, Unrealized Gains | 10 | 166
Debt and equity securities, Unrealized Losses | (242) | (140)
Debt and equity securities, Estimated Fair Value | 265,775 | 250,208
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 112,854 | 75,315
Debt securities, Unrealized Gains | 3 | 47
Debt securities, Unrealized Losses | (115) | (28)
Debt securities, Estimated Fair Value | 112,742 | 75,334
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 153,153 | 174,867
Debt securities, Unrealized Gains | 7 | 119
Debt securities, Unrealized Losses | (127) | (112)
Debt securities, Estimated Fair Value | $ 153,033 | $ 174,874

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