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Trade Payables and Accrued Liabilities (Tables)
 6 Months Ended
Jun. 30, 2019
Trade and other current payables [abstract]  
Summary of Trade Payables and Accrued Liabilities
   June 30, 2019   December 31, 2018 
Trade payables   352    477 
Amounts due to related parties (Note 9)   6    1 
Accrued liabilities   3    78 
    361    556