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Consolidated Financial Statements Details - Schedule of Other Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income And Expenses [Abstract]
Interest income, net	$ 169	$ 181
Change in fair value of warrant liability	(13)
Other	55	2
Other income, net	$ 211	$ 183

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 28
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-Section 25
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The net amount of operating interest income (expense).

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-SubTopic 220
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Amount of gain (loss) related to nonoperating activities, classified as other.

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