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Key management (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Of Information About Key Management [Abstract]  
Disclosure of compensation, key management [Table Text Block]
    2019     2018  
    $     $  
             
Salaries and short-term employee benefits   6,182     4,416  
Share-based compensation   5,151     3,086  
Cost recoveries from associates   (600 )   (490 )
    10,733     7,012