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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative [Line Items]        
Derivative income (expense) $ 640,153 $ 4,801,862 $ 1,342,991 $ 1,712,030
Redemptions of Senior Convertible Notes 230,300   863,651  
Total derivative income (expense) 870,453 4,801,862 2,206,642 1,712,030
Senior Convertible Notes [Member]
        
Derivative [Line Items]        
Derivative income (expense) 202,034 2,274,033 244,303 1,174,205
Series G Convertible Preferred Stock [Member]
        
Derivative [Line Items]        
Derivative income (expense)   286,335   158,711
Warrant Derivatives [Member]
        
Derivative [Line Items]        
Derivative income (expense) $ 438,119 $ 2,241,494 $ 1,098,688 $ 379,114