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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance	$ 770,964
New Issues	5,666,935
Change in fair value of warrant liability	(278,228)	$ 347,330
Fair value of warrant liability, ending balance	6,159,671
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, ending balance	1,761,000
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, ending balance	3,887,000
December 2011 Financing [Member] | Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair value of warrant liability, beginning balance	770,964
Change in fair value of warrant liability	(259,370)
Fair value of warrant liability, ending balance	511,594
March 2016 Financing [Member] | Series A Warrants [Member]
Class of Warrant or Right [Line Items]
New Issues	1,770,596
Change in fair value of warrant liability	(9,659)
Fair value of warrant liability, ending balance	1,760,937
March 2016 Financing [Member] | Series B Warrants [Member]
Class of Warrant or Right [Line Items]
New Issues	3,896,339
Change in fair value of warrant liability	(9,199)
Fair value of warrant liability, ending balance	$ 3,887,140

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Fair value of warrant liability.

+ References

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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=56944662&loc=d3e3602-108585

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