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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
One year or less, amortized cost	$ 85,227	$ 38,836
Greater than one year and less than five years, amortized cost	9,939	12,032
Amortized Cost	95,166	50,868
One year or less, fair value	84,957	38,781
Greater than one year and less than five years, fair value	9,928	11,990
Total available-for-sale securities fair value	$ 94,885	$ 50,771

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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