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Stock Warrants Liability (Tables)
12 Months Ended
Dec. 31, 2014
Stock Warrants Liability [Abstract]  
Summary of Stock Warrants Liability Activity


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

        $           $