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Net Loss per Share - Schedule of Anti-dilutive Securities Excluded from Diluted Loss Per Share (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 15,164,789 17,270,346
Stock Options Granted [Member]
   
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 4,141,948 3,350,115
Warrants [Member]
   
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share    8,286,689
Convertible Notes [Member]
   
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 11,022,841 5,633,542