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Trade Payables and Accrued Liabilities (Tables)
 6 Months Ended
Jun. 30, 2018
Trade and other current payables [abstract]  
Summary of Trade Payables and Accrued Liabilities

    June 30, 2018     December 31, 2017  
Trade payables     2,353       813  
Amounts due to related parties (Note 9)     62       42  
Accrued liabilities     5       114  
      2,420       969