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17. Share Based Payments (Details)
12 Months Ended
Apr. 20, 2018
Y
Dec. 31, 2019
USD ($)
Y
$ / shares
Dec. 31, 2018
USD ($)
Y
$ / shares
Share Based Payments      
Fair value at grant date | $   $ 2.10 $ 1.20
Share price at grant date | $ / shares   $ 1.44 $ 1.91
Exercise price | $ / shares   $ 1.44 $ 1.92
Expected volatility   82.00% 72.00%
Expected life | Y 2 5.9 5.9
Expected dividends | $   $ 0.00 $ 0.00
Risk-free interest rate   2.09% 0.34%