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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
One year or less, amortized cost	$ 58,472	$ 85,227
Greater than one year and less than five years, amortized cost	12,568	9,939
Amortized Cost	71,040	95,166
One year or less, fair value	58,556	84,957
Greater than one year and less than five years, fair value	12,623	9,928
Total available-for-sale securities fair value	$ 71,179	$ 94,885

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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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