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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Investments Debt And Equity Securities [Abstract] |  |
One year or less, amortized cost | $ 49,997 | $ 85,227
Greater than one year and less than five years, amortized cost | 22,571 | 9,939
Amortized Cost | 72,568 | 95,166
One year or less, fair value | 50,034 | 84,957
Greater than one year and less than five years, fair value | 22,625 | 9,928
Total available-for-sale securities fair value | $ 72,659 | $ 94,885

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