Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2018
Stockholders' equity:  
Schedule of equity compensation plans

Stock option activity under all of the Company’s Plans during the six months ended June 30, 2018 is summarized below:

 

      Shares     Weighted -
Average Exercise
Price
 
Outstanding at December 31, 2017       1,238,199     $ 12.47  
Granted       75,000       2.18  
Forfeited       (6,745 )     6.41  
Outstanding at June 30, 2018       1,306,454     $ 11.91  
                     
Schedule of share-based compensation expense

The Company records share-based compensation expense on a straight-line basis over the related vesting period. For the three and six months ended June 30, 2018 and 2017, share-based compensation expense related to options was:

 

           
Three Months Ended June 30,  
2018   2017  
$ 283,160   $ 222,130  

 

 

           
Six Months Ended June 30,  
2018   2017  
$ 607,124   $ 429,026  

 

 

Schedule of common stock warrant activity

Warrants have generally been issued for terms of up to five years. Common stock warrant activity for the six months ended June 30, 2018 was as follows:

 

      Shares     Weighted -
Average Exercise
Price
 
Outstanding at December 31, 2017      8,949,078      $ 4.12    
Issued              
Exercised     (251,773   )   2.20    
Expired / Terminated     (49,749     2.00    
Outstanding at June 30, 2018     8,647,556      $ 4.19