Employee Stock Options (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Schedule of assumptions used to estimate fair value stock options granted
    March 31, 2019  
       
Expected dividend yield     0 %
Expected volatility     90 %
Risk-free interest rate     2.40 %
Expected life of options     4.00 years  
  
Employee Stock Option [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Schedule of assumptions used to estimate fair value stock options granted
    2019  
Expected dividend yield     0 %
Expected volatility     90 %
Risk-free interest rate     2.40-2.47 %
Expected life of options     4.0 years  

 

    2018  
       
Expected dividend yield     0 %
Expected volatility     83-86 %
Risk-free interest rate     2.49 %
Expected life of options     2.50-3.00 years  
  2018     2017  
Expected dividend yield     0 %     0 %
Expected volatility     80-96 %     82-101 %
Risk-free interest rate     2.41-2.93 %     1.50-2.62 %
Expected life of options     4.0 years       2.5-4.0 years  
Schedule of stock option activity
    Number of Options     Weighted
Average
Exercise Price per Share		     Weighted
Average
Contractual
Life in
Years		     Aggregate Intrinsic
Value		  
Outstanding – December 31, 2018     13,990,000     $ 0.61       3.15          
Exercisable – December 31, 2018     13,610,000     $ 0.59       3.16     $ 0  
Granted     130,000     $ 1.06                  
Cancelled or Expired     (50,000 )   $ 0.90                  
Outstanding – March 31, 2019     14,070,000     $ 0.61       2.92          
Exercisable – March 31, 2019     13,700,000     $ 0.60       2.91     $ 6,340,000  

 

    Number of Options     Weighted
Average
Exercise Price per Share		     Weighted Average Contractual Life in Years     Aggregate Intrinsic
Value		  
Outstanding – December 31, 2017     7,945,000     $ 1.38       3.50          
Exercisable – December 31, 2017     7,627,500     $ 1.35       3.50     $       0  
Granted     100,000     $ 1.00                  
Cancelled or Expired     -     $ .00                  
Outstanding – March 31, 2018     8,045,000     $ 1.37       3.27     $ 0  
Exercisable – March 31, 2018     7,677,500     $ 1.36       3.25     $ 0  

 
    Number of Options     Weighted
Average
Exercise Price per Share		     Weighted
Average
Contractual
Life in
Years		     Aggregate Intrinsic
Value		  
Outstanding – December 31, 2016     442,500     $ 5.81       1.72                     
Exercisable – December 31, 2016     407,500     $ 5.57       1.65     $ 0  
Granted     7,510,000     $ 1.12                  
Cancelled or Expired     (7,500 )   $ 4.18                  
Outstanding – December 31, 2017     7,945,000     $ 1.38       3.50          
Exercisable – December 31, 2017     7,627,500     $ 1.35       3.50     $ 0  
Granted     11,560,000     $ 0.82                  
Cancelled or Expired     (5,515,000 )   $ 1.37                  
Outstanding – December 31, 2018     13,990,000     $ 0.61       3.15     $    
Exercisable – December 31, 2018     13,610,000     $ 0.59       3.16     $ 0