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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
One year or less, amortized cost | $ 24,586 | $ 28,284
Greater than one year and less than five years, amortized cost | 47,089 | 55,544
Amortized Cost | 71,675 | 83,828
One year or less, fair value | 24,146 | 27,907
Greater than one year and less than five years, fair value | 45,194 | 53,134
Total available-for-sale securities fair value | $ 69,340 | $ 81,041

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