Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative liabilities	$ 1,125,749	$ 970,823
Common shares linked to derivative liabilities		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	1,125,749	923,580
Warrant and Share Purchase Option Derivatives [Member]
Derivative [Line Items]
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 and Share Purchase Option Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	140,828	840,000
Common shares linked to derivative liabilities	1,562,500	1,562,500
2014 Share Purchase Option [Member] | Warrant and Share Purchase Option Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	984,921
Series G Convertible Preferred Stock [Member] | Warrant and Share Purchase Option Derivatives [Member]
Derivative [Line Items]
Derivative liabilities		$ 83,580
Common shares linked to derivative liabilities		525,000