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Common Stock Warrants
 6 Months Ended
Jun. 30, 2015
Common Stock Warrants
4. Common Stock Warrants

The following table summarizes the common stock warrant activity from December 31, 2014 through June 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, March 31, 2015

      5,370,995      $ 3.64