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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Investments Debt And Equity Securities [Abstract] |  |
One year or less, amortized cost | $ 32,200 | $ 44,873
Greater than one year and less than five years, amortized cost | 51,042 | 43,046
Amortized Cost | 83,242 | 87,919
One year or less, fair value | 32,044 | 44,952
Greater than one year and less than five years, fair value | 49,045 | 42,818
Total available-for-sale securities fair value | $ 81,089 | $ 87,770

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