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Fair Value Measurements - Summary of Issuances, Changes in Fair Value and Classifications of Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	$ 948	$ 1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants	4,958
Change in estimated fair value	(206)	(126)
Ending Balance	5,700	948
Significant Unobservable Inputs (Level 3), Contingent Consideration Liability [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	948	1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants	0
Change in estimated fair value	(456)	(126)
Ending Balance	492	948
Significant Unobservable Inputs (Level 3), Warrants To Purchase Common Stock [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	0	0
Warrants issued in conjunction with Private Placement and Subsequent Financing on April 14, 2016 and June 15, 2016, respectively, and Placement Agent Warrants	4,958
Change in estimated fair value	250	0
Ending Balance	$ 5,208	$ 0

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+ References

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- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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