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Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from Diluted Loss Per Share (Detail)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from diluted earnings per share 19,287,215 13,107,162
Stock options [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 4,996,215 3,417,115
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 3,291,000 1,381,113
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 11,000,000 8,308,934