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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 19,794,450 11,282,286
Options [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 381,851 443,926
Restricted stock units [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 3,144,940 1,236,982
Outstanding warrants [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 16,267,659 9,601,378