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Trade and other receivables (Tables)
9 Months Ended
Sep. 30, 2018
Trade and other receivables [abstract]  
Schedule of Trade and Other Receivables
 
 
September 30,
   
December 31,
 
 
 
2018
   
2017
 
 
           
Trade receivables
 
$
3,711
   
$
3,779
 
Value added taxes receivable
   
1,746
     
2,751
 
Other receivables
   
189
     
101
 
 
 
$
5,646
   
$
6,631