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Share Option and Warrant Reserves (Details 3)
 12 Months Ended
Dec. 31, 2020
shares
yr
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding | shares 8,141,004 5,602,619 4,192,253
Options outstanding, exercise price | $ / shares $ 2.67 $ 2.96 $ 2.74
Options outstanding, remaining contractual life 3 years 5 months 23 days    
Number of options exercisable | shares 4,989,454    
Options exercisable, exercise price | $ / shares $ 2.80    
Options exercisable, remaining contractual life | yr 2.62    
Exercise Price Range 1      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding | shares 1,596,218    
Options outstanding, exercise price | $ / shares $ 1.68    
Options outstanding, remaining contractual life 3 years 10 months 28 days    
Number of options exercisable | shares 1,418,418    
Options exercisable, exercise price | $ / shares $ 1.49    
Options exercisable, remaining contractual life | yr 3.74    
Exercise Price Range 2      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding | shares 6,308,503    
Options outstanding, exercise price | $ / shares $ 2.68    
Options outstanding, remaining contractual life 3 years 5 months 16 days    
Number of options exercisable | shares 3,334,753    
Options exercisable, exercise price | $ / shares $ 2.90    
Options exercisable, remaining contractual life | yr 2.26    
Exercise Price Range 3      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding | shares 207,113    
Options outstanding, exercise price | $ / shares $ 8.60    
Options outstanding, remaining contractual life 1 year 22 days    
Number of options exercisable | shares 207,113    
Options exercisable, exercise price | $ / shares $ 8.60    
Options exercisable, remaining contractual life | yr 1.06    
Exercise Price Range 4      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of options outstanding | shares 29,170    
Options outstanding, exercise price | $ / shares $ 12.94    
Options outstanding, remaining contractual life 3 months 25 days    
Number of options exercisable | shares 29,170    
Options exercisable, exercise price | $ / shares $ 12.94    
Options exercisable, remaining contractual life | yr .32