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Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2019
Shareholders' Equity  
Schedule of Weighted Average Assumptions

The following weighted-average assumptions were used for awards granted during the three and six months ended June 30, 2019 and 2018:

 

   Three months ended June 30,   Six months ended June 30, 
   2019   2018   2019   2018 
Weighted average risk-free rate   1.82%   2.88%   1.82%   2.88%
Weighted average volatility   113.98%   113.09%   113.98%   113.09%
Dividend yield   0.00%   0.00%   0.00%   0.00%
Expected term   5.78 years    7.24 years    5.78 years    7.24 years