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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Shareholders' Equity  
Schedule of Weighted Average Assumptions

The following weighted-average assumptions were used for stock option awards granted during the three and nine months ended September 30, 2019:

 

    Three months ended     Nine months ended  
    September 30, 2019     September 30, 2019  
Weighted average risk-free rate     1.39 %     1.70 %
Weighted average volatility     95.11 %     108.83 %
Dividend yield     0.00 %     0.00 %
Expected term     5.61 years       5.73 years  
Schedule of Restricted Stock and Common Stock Unit Vested

The following table shows the number of RSUs that vested and were settled during the three and nine months ended September 30, 2020 and 2019, as well as the number of shares of common stock issued upon settlement. In lieu of paying cash to satisfy withholding taxes due upon the settlement of vested RSUs, an employee may elect to have shares of common stock withheld that would otherwise be issued at settlement, the value of which is equal to the amount of withholding taxes payable.

 

    Three months ended
September 30,		     Nine months ended
September 30,		  
    2020     2019     2020     2019  
Restricted stock units vested and settled     19,000       18,000       39,000       29,000  
Common stock issued, net of shares withheld     14,000       13,000       28,000       20,000