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Other investments (Tables)
 12 Months Ended
Dec. 31, 2019
Other Investment Abstract  
Disclosure of detailed information about other investments [Table Text Block]
          2019         2018    
          $         $    
Fair value through profit or loss (warrants)                  
      Balance - January 1   3,348         8,092    
      Acquisitions   1,085         3,093    
      Exercise   (1,055 )       -    
      Change in fair value   (1,089 )       (7,837 )  
      Deemed disposal (Note 7)   (589 )       -    
          1,700         3,348    
                         
Fair value through other comprehensive income (shares)                  
    Balance - January 1   104,055         106,841    
      Acquisitions   27,259         14,453    
      Transfer from associates (Note 12)   9,676         46,625    
      Change in fair value   13,287         (29,773 )  
      Transfer to associates (Note 12)   -         (7,048 )  
      Disposals - Share Repurchase (Note 21)   (90,546 )       -    
      Disposals (i)   (6,322 )       (27,043 )  
    Balance - December 31   57,409         104,055    
                         
Amortized cost                  
    Balance - January 1   2,200         200    
      Acquisition (Note 14)   8,778         2,000    
      Transfer to short-term investments   (2,200 )       -    
    Balance - December 31   8,778         2,200    
 
Total		   67,886         109,603    

(i) In 2019, an investment in a company classified as an investment at fair value through other comprehensive income was acquired by way of a share exchange. This non-cash transaction resulted in the disposal of the investment in the acquiree and the acquisition of an investment in the acquirer for an amount of $5.7 million.