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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance			$ 770,964
Change in fair value of warrant liability	$ (5,568,634)	$ (988,367)	(5,846,862)	$ (641,037)
Fair value of warrant liability, ending balance	591,037		591,037
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, ending balance	160,000		160,000
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, ending balance	374,000		374,000
December 2011 Financing [Member] | Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance			511,594
Change in fair value of warrant liability			(454,308)
Fair value of warrant liability, ending balance	57,286		57,286
March 2016 Financing [Member] | Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance			1,760,937
Change in fair value of warrant liability			(1,600,713)
Fair value of warrant liability, ending balance	160,224		160,224
March 2016 Financing [Member] | Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance			3,887,140
Change in fair value of warrant liability			(3,513,613)
Fair value of warrant liability, ending balance	$ 373,527		$ 373,527

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Fair value of warrant liability.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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