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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Estimated Values of Stock Option Grants Valuation Assumptions

The weighted average estimated values of director and employee stock option grants, as well as the weighted average assumptions that were used in calculating such values during the twelve months ended December 31, 2019 and 2018, were based on estimates at the date of grant as follows:

 

    April 30,     January 1,     February 10,  
    2015 Grant     2016 Grant     2016 Grant  
Risk-free interest rate     1.43 %     1.76 %     1.15 %
Weighted average expected term     5 years       5 years       5 years  
Expected volatility     143.10 %     134.18 %     132.97 %
Expected dividend yield     0.00 %     0.00 %     0.00 %

 

    December 6,     September 25,  
    2016 Grant     2017 Grant  
Risk-free interest rate     1.84 %     1.85 %
Weighted average expected term     5 years       5 years  
Expected volatility     123.82 %     130.79 %
Expected dividend yield     0.00 %     0.00 %

 

    January 30,     March 11,  
    2019 Grant     2019 Grant  
Risk-free interest rate     2.54 %     2.44 %
Weighted average expected term     5 years       5 years  
Expected volatility     115.80 %     116.46 %
Expected dividend yield     0.00 %     0.00 %
Schedule of Stock Option Activity

A summary of stock option activity during the twelve months ended December 31, 2019 and 2018 is as follows:

 

                Weighted-        
          Weighted-     Average        
    Shares     Average     Remaining     Aggregate  
    Under     Exercise     Contractual     Intrinsic  
    Option     Price     Life     Value  
Outstanding at January 1, 2018     2,238,000     $ 0.55       9 years       79,200  
                                 
Outstanding at December 31, 2018     2,238,000     $ 0.55       8 years     $ 79,200  
                                 
Exercisable at December 31, 2018     1,589,250     $ 0.57       8 years     $ 79,200  

 

            Weighted-    
        Weighted-   Average    
    Shares   Average   Remaining   Aggregate
    Under   Exercise   Contractual   Intrinsic
    Option   Price   Life   Value
Outstanding at January 1, 2019     2,238,000     $ 0.55     8 years     79,200  
Granted     2,177,500       0.13              
Forfeited and expired     (2,072,500 )     0.84              
                             
Outstanding at December 31, 2019     2,343,000     $ 0.13     9 years   $ 19,200  
                             
Exercisable at December 31, 2019     1,773,000     $ 0.20     9 years   $ 19,200