Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative liabilities	$ 599,844	$ 970,823
Common shares linked to derivative liabilities	1,562,500	3,817,147
Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities		47,243
Common shares linked to derivative liabilities		1,729,647
Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	599,844	923,580
Common shares linked to derivative liabilities	1,562,500	2,087,500
Senior Convertible Notes [Member] | Compound Embedded Derivative [Member]
Derivative [Line Items]
Derivative liabilities		47,243
Common shares linked to derivative liabilities		1,729,647
Senior Convertible Notes [Member] | Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	599,844	840,000
Common shares linked to derivative liabilities	1,562,500	1,562,500
Series G Convertible Preferred Stock [Member] | Warrant Derivatives [Member]
Derivative [Line Items]
Derivative liabilities		$ 83,580
Common shares linked to derivative liabilities		525,000