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Derivative Financial Instruments - Changes in Fair Value Inputs and Assumptions Related to Derivative Warrants (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Oct. 11, 2010
Dec. 31, 2013
Compound Embedded Derivative [Member]
Dec. 31, 2012
Compound Embedded Derivative [Member]
Derivative [Line Items]        
Beginning balance     $ 1,529,583 $ 2,680,133
Senior Convertible Note Financing 9,955,000 928,481   1,291,298
Expirations from redemptions of Series G Convertible Preferred Stock     (889,340) (810,669)
Changes in fair value inputs and assumptions reflected in income     (593,001) (1,631,179)
Ending balance     $ 47,242 $ 1,529,583