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Accounts payable and accrued liabilities
12 Months Ended
Dec. 31, 2017
Trade And Other Current Payables [Abstract]  
Accounts payable and accrued liabilities

11. Accounts payable and accrued liabilities

20172016
Trade payables$177,040$213,481
Non-trade payables75,78485,632
Payables due to related parties5,58113,787
Total$258,405$312,900

The Company’s exposure to currency and liquidity risk related to trade and other payables is disclosed in note 24.