Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Total derivative income (expense)	$ (1,175,971)	$ 1,001,679	$ 4,385,380
Senior Convertible Notes [Member]
Derivative [Line Items]
Derivative income (expense)		47,243
2014 Convertible Promissory Notes [Member]
Derivative [Line Items]
Derivative income (expense)	(1,280,873)	141,983
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative income (expense)	$ 104,902	$ 812,453