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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions

The following table provides the weighted average assumptions used in determining the fair value of the stock option awards granted during the nine month periods ended September 30, 2019 and 2018.

 

    Nine Months Ended  
    September 30, 2019     September 30, 2018  
    (unaudited)  
Risk-free interest rate     2.51 %     2.65 %
Expected life     6.0 years       6.0 years  
Expected volatility     127.81 %     126.93 %
Dividend yield     -       -