Stock Warrants Liability
 12 Months Ended
Dec. 31, 2014
Stock Warrants Liability [Abstract]  
Stock Warrants Liability

10.

Stock Warrants Liability


The summary of stock warrants liability activity for the years ended December 31, 2014 and 2013 is as follows:


Number of
Warrants

  

Weighted
Average
Exercise
Price

    

Weighted
Average
Remaining
Contractual
Life (in years)

    

Weighted
Average
Fair Value

  
                 

Outstanding at December 31, 2012

 20,549     $ 4.83       8.9     $ 1.64  

Granted

     —       —       —       —  

Exercised

     —       —       —       —  

Expired/cancelled

     —       —       —       —  

Outstanding at December 31, 2013

     20,549     $ 4.83       8.2     $ 5.95  

Granted

     52,695     $ 4.27       10.0     $ 6.13  

Exercised

     (73,244 )   $ 4.43       9.5     $ 6.08  

Expired/cancelled

     —       —       —       —  

Outstanding at December 31, 2014

     —     $ —       —     $ —  


The aggregate intrinsic value of the stock warrants in the table above is $0 and $46,646 at December 31, 2014 and 2013, respectively. The aggregate intrinsic value is before applicable income taxes and is calculated based on the difference between the exercise price of the warrants and the estimated fair market value of the Company's common stock as of the respective dates.