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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 17,720,536 13,685,651
Options [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 375,670 440,126
Restricted stock units [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 3,137,440 3,350,616
Outstanding Warrants [Member]
   
Class of Stock [Line Items]    
Outstanding options, warrants and restricted stock units 14,207,426 9,894,909