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Investments in Associate (Disclosure of Associates) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]    
Shares and warrants presented as marketable securities at beginning $ 1,331 $ 4,277
Write down of investment   (2,721)
Share of net income (loss) (76) (225)
Transfer to investments in equity securities (1,255)  
Shares and warrants presented as marketable securities at ending   1,331
Medgold    
Disclosure of associates [line items]    
Shares and warrants presented as marketable securities at beginning 974 3,075
Write down of investment   (1,937)
Share of net income (loss) (47) (164)
Transfer to investments in equity securities (927)  
Shares and warrants presented as marketable securities at ending   974
Prospero    
Disclosure of associates [line items]    
Shares and warrants presented as marketable securities at beginning 357 1,202
Write down of investment   (784)
Share of net income (loss) (29) (61)
Transfer to investments in equity securities $ (328)  
Shares and warrants presented as marketable securities at ending   $ 357