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

    September 30, 2018     December 31, 2017  
Trade payables     1,256       813  
Amounts due to related parties (Note 9)     1       42  
Accrued liabilities     371       114  
      1,628       969