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Common Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2014
Common Stock Warrant Activity

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

 

     Shares      Weighted Average
Exercise Price
 

Outstanding, December 31, 2013

     6,035,229      $ 3.63  

Granted

     —           —    

Exercised

     529,650         3.12  

Forfeited/cancelled

     —           —    
  

 

 

    

Outstanding, March 31, 2014

     5,505,579      $ 3.67