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Net loss per share (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Earnings Per Share [Abstract]  
Disclosure of detailed information of earnings per share [Table Text Block]
      2019     2018  
      $     $  
               
Net loss   (234,195 )   (105,587 )
             
Basic weighted average number of common shares outstanding (in thousands)   151,266     156,617  
  Dilutive effect of share options   -     -  
  Diluted weighted average number of common shares   151,266     156,617  
               
Net loss per share            
  Basic and diluted   (1.55 )   (0.67 )