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Trade Payables and Accrued Liabilities (Tables)
 3 Months Ended
Mar. 31, 2019
Trade and other current payables [abstract]  
Summary of Trade Payables and Accrued Liabilities

    March 31, 2019     December 31, 2018  
Trade payables     344       477  
Amounts due to related parties (Note 9)     13       1  
Accrued liabilities     27       78  
      384       556