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Potentially Dilutive Securities Outstanding (Detail) - shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 85,549,387 40,982,544
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 28,219,831 19,985,768
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 48,702,990 4,090,013
Restricted Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities outstanding 4,553,757 2,198,173