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Related party transactions (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of transactions between related parties [abstract]  
Disclosure of detailed information about general and administrative expenses and business development expense [Table Text Block]
    2019     2018  
    $     $  
Amounts invoiced to associates as a reduction of:            
  General and administrative expenses   973     1,409  
  Business development expenses   2,371     3,749  
Total amounts invoiced to associates   3,344     5,158