Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

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

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

 

      Shares     Weighted -
Average Exercise
Price
 
Outstanding at December 31, 2017       1,238,199     $ 12.47  
Granted       147,500       1.81  
Forfeited       (13,162 )     15.02  
Outstanding at September 30, 2018       1,372,537     $ 11.30  
                     

 

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 nine months ended September 30, 2018 and 2017, share-based compensation expense related to options was:

 

Three Months Ended September 30,  
2018   2017  
$ 208,207   $ 186,982  

 

Nine Months Ended September 30,  
2018   2017  
$ 968,488   $ 616,007  
Schedule of common stock warrant activity

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

 

      Shares     Weighted -
Average Exercise
Price
 
Outstanding at December 31, 2017      8,949,078      $ 4.12    
Issued              
Exercised     (221,773   )   2.20    
Expired / Terminated     (49,749     2.00    
Outstanding at September 30, 2018     8,677,556      $ 4.18