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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost	$ 6,329
Unrealized Gains	0
Unrealized Losses	0
Fair Value	6,329
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	4,765	$ 7,104
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	4,765	$ 7,104
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	1,564
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 1,564

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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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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+ References

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-Publisher FASB
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Amount 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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