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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost	$ 7,443
Unrealized Gains	1
Unrealized Losses	0
Fair Value	7,444
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	6,372	$ 7,104
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	6,372	$ 7,104
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	1,071
Unrealized Gains	1
Unrealized Losses	0
Fair Value	$ 1,072

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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