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Potentially Dilutive Securities Outstanding (Detail) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 32,280,590 45,171,595
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 24,102,471 21,615,264
Convertible Debt Securities    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 4,072,809 14,708,590
Warrant    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 159,303 6,200,721
Restricted Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 3,946,007 2,647,020