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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Assumptions in Computing Option Fair Value

The fair value of all options granted during the three and six months ending June 30, 2015 was determined using the following assumptions:

 

Expected volatility

    70% - 90%

Risk free interest rate

    0.80% - 1.75%

Expected term (years)

    3.0 - 5.0

Dividend yield

    0%

Summary of Activity Related to Options Granted

Stock option activity is as follows:

 

     Number of
Options		      Weighted
Average
Exercise Price		      Weighted
Average
Remaining
Contractual Life		    Aggregate Fair
Value		  

Outstanding December 31, 2013

      4,045,324       $ 1.85       2.05 Years    $ 7,483,849   

Granted

      252,000       $ 3.80         

Exercised

      (1,138,331 )     $ 0.78         

Forfeited

      (14,000 )     $ 2.43         

Expired

      —           —           
  

 

 

     

 

 

        

Outstanding December 31, 2014

      3,144,993       $ 2.39       1.48 Years    $ 7,516,533   

Granted

      —           —           

Exercised

      (218,010 )     $ 1.50         

Forfeited

      —           —           

Expired

      —           —           
  

 

 

     

 

 

        

Outstanding June 30, 2015

      2,926,983       $ 2.45       .75 Years    $ 7,171,108   

Exercisable at June 30, 2015

      2,724,650       $ 2.39          $ 6,511,914   

Unvested at June 30, 2015

      202,333