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Potentially Dilutive Securities Outstanding (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Income Loss Per Common Share [Line Items]      
Potentially dilutive securities outstanding 78,475,367 128,324,123 34,048,852
Stock Options
     
Net Income Loss Per Common Share [Line Items]      
Potentially dilutive securities outstanding 24,237,940 18,674,539 10,082,351
Convertible Debt Securities
     
Net Income Loss Per Common Share [Line Items]      
Potentially dilutive securities outstanding 25,415,366 19,826,113 19,826,113
Warrant Liability
     
Net Income Loss Per Common Share [Line Items]      
Potentially dilutive securities outstanding 19,706,240 86,062,440  
Restricted Stock
     
Net Income Loss Per Common Share [Line Items]      
Potentially dilutive securities outstanding 9,115,821 3,761,031 4,140,388