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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
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 six month periods ended June 30, 2020 and 2019.

 

    June 30, 2020     June 30, 2019  
    (unaudited)  
Risk-free interest rate     1.20 %     2.51 %
Expected life     5.9 years       6.0 years  
Expected volatility     124.16 %     127.81 %
Dividend yield     -       -