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Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2014
Common Stock Warrant Activity

The following table summarizes the common stock warrant activity from December 31, 2013 through September 30, 2014:

 

     Shares     Weighted Average
Exercise Price
 

Outstanding, December 31, 2013

     6,035,229      $ 3.63   

Granted

     —         —    

Exercised

     576,734        3.11   

Forfeited/cancelled

     (7,500     15.00   
  

 

 

   

Outstanding, September 30, 2014

     5,450,995      $ 3.66