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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 27,180,850 13,662,749
Options [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 317,729 431,558
Restricted stock units [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 3,384,940 3,336,282
Outstanding Warrants [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 23,478,181 9,894,909