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Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2019
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 and 2018:

 

  

Three months ended

September 30,

  

Nine months ended

September 30,

 
   2019   2018   2019   2018 
Weighted average risk-free rate   1.39%   2.82%   1.70%   2.87%
Weighted average volatility   95.11%   113.90%   108.83%   113.20%
Dividend yield   0.00%   0.00%   0.00%   0.00%
Expected term   5.61 years    5.92 years    5.73 years    7.06 years 
Schedule of Stock Awards Granted

For the three and nine months ended September 30, 2019 and 2018, the Company granted the following awards:

 

  

Three months ended

September 30,

  

Nine months ended

September 30,

 
   2019   2018   2019   2018 
Stock option grants   1,000    250    2,000    2,000 
Restricted stock units   30,000    -    77,000    53,000 
Schedule of Restricted Stock and Common Stock Unit Vested

The following table shows the number of restricted stock units that vested and were settled during the three and nine months ended September 30, 2019 and 2018, 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 restricted stock units, 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,

 
   2019   2018   2019   2018 
Restricted stock units vested and settled   18,000    9,000    29,000    9,000 
Common stock issued, net of shares withheld   12,000    6,000    19,000    6,000