Quarterly report pursuant to Section 13 or 15(d)

12. Stock Options (Tables)

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12. Stock Options (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
      Options Outstanding Number of Shares      

Exercise Price

per Share

      Weighted Average Remaining Contractual Life       Aggregate Intrinsic Value       Weighted Average Exercise Price per Share  
Balance at December 31, 2017     1,294,045     $ 2.09 - 12.00        2.99 years     $     $ 8.14  
Options Granted     170,176       $2.09        4.55 years               2.09   
Options Exercised                                      
Options Cancelled     57,294     $ 9.00 – 12.00        3.56 years      $     $ 10.08  
Options Expired     31,670        2.80 - 6.00                        4.30   
Balance at September 30, 2018     1,375,257     $ 2.09 - 12.00        2.50 years     $     $ 7.39  
                                         
Exercisable December 31, 2017     1,070,869     $ 2.82 - 9.00        2.96 years     $     $ 7.44  
Exercisable September 30, 2018     1,039,199     $ 2.82 - 9.00        2.20 years     $     $ 7.53  
Assumptions used

 

During the year ended December 31, 2015, the Company granted options to purchase 1,407,775 shares of Common Stock to officers, directors, employees, and consultants. These stock options generally vest between one and three years, while a portion vested upon grant. The fair value of these options was determined to be $2,402,460 using the Black-Scholes option pricing model based on the following assumptions:

 

Exercise Price $2.82 - $12.00
Dividend Yield 0%
Volatility 100% - 137%
Risk-free interest rate 0.89% - 1.25%
Expected life of options 2.5 - 3.5 years

 

During the three months ended September 30, 2018, the Company granted options to purchase 170,176 shares of common stock to officers. These stock options generally vest between one and three years. The fair value of these options was determined to be $285,760 using the Black-Scholes option pricing model based on the following assumptions:

 

Exercise Price $2.09
Dividend Yield 0%
Volatility 61% - 62%
Risk-free interest rate 2.52% - 2.57%
Expected life of options  3.5 years