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Accounts payable and accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Accounts Payable and Accrued Liabilities
    

December 31, 2017

$

     

December 31, 2016

$

  

Trade payables

      60,081        43,712  

Taxes payable

      213        243  

Accrued expenses

      50,357        46,750    
     110,651        90,705