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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative [Line Items]        
Derivative income (expense) $ 1,803,137 $ (3,212,901) $ 702,838 $ (3,089,832)
Redemptions of Senior Convertible Notes 195,462   633,351  
Total derivative income (expense) 1,998,599 (3,212,901) 1,336,189 (3,089,832)
Senior Convertible Notes [Member]
        
Derivative [Line Items]        
Derivative income (expense) 682,831 (1,611,725) 42,269 (1,099,828)
Series G Convertible Preferred Stock [Member]
        
Derivative [Line Items]        
Derivative income (expense)   (88,697)   (127,624)
Warrant Derivatives [Member]
        
Derivative [Line Items]        
Derivative income (expense) $ 1,120,306 $ (1,512,479) $ 660,569 $ (1,862,380)