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Common Stock Warrants
9 Months Ended
Sep. 30, 2015
Common Stock Warrants
4. Common Stock Warrants

The following table summarizes the common stock warrant activity from December 31, 2014 through September 30, 2015:

 

     Shares      Weighted Average
Exercise Price
 

Outstanding, December 31, 2014

     5,470,995       $ 3.67   

Granted

     —          —    

Exercised

     —          —    

Forfeited/cancelled

     (100,000      4.26   
  

 

 

    

Outstanding, September 30, 2015

     5,370,995       $ 3.64