Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Derivative income (expense)	$ (182,713)	$ (1,100,299)
Redemptions of Senior Convertible Notes		437,889
Total derivative income (expense)	(182,713)	(662,410)
Senior Convertible Notes [Member]
Derivative [Line Items]
Derivative income (expense)	47,243	(640,562)
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative income (expense)	$ (229,956)	$ (459,737)

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=7476318&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=7476318&loc=SL5624171-113959

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration