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Investments in Associate (Disclosure of Associates) (Details) - USD ($)
$ in Thousands
 5 Months Ended 12 Months Ended
May 18, 2018
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]      
Shares and warrants presented as marketable securities at beginning $ 2,694 $ 4,277 $ 2,694
Fair value adjustments (99)    
Exercise of warrants     624
Purchase of additional shares     523
Write down of investment   (2,721)  
Share of net income (loss)   (225) (21)
Shares and warrants presented as marketable securities at ending   1,331 4,277
Medgold      
Disclosure of associates [line items]      
Shares and warrants presented as marketable securities at beginning 2,694 3,075 2,694
Purchase of additional shares     249
Write down of investment   (1,937)  
Share of net income (loss)   (164) 132
Shares and warrants presented as marketable securities at ending   974 3,075
Prospero      
Disclosure of associates [line items]      
Shares and warrants presented as marketable securities at beginning 556 1,202 556
Fair value adjustments $ (99)    
Exercise of warrants     624
Purchase of additional shares     274
Write down of investment   (784)  
Share of net income (loss)   (61) (153)
Shares and warrants presented as marketable securities at ending   $ 357 $ 1,202