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Trade and other receivables (Tables)
12 Months Ended
Dec. 31, 2017
Trade and other receivables [abstract]  
Schedule of Trade and Other Receivables
 
 
December 31,
   
December 31,
 
 
 
2017
   
2016
 
 
           
Trade receivables
 
$
3,779
   
$
2,126
 
Value added taxes receivable
   
2,751
     
1,638
 
Other receivables
   
101
     
238
 
 
 
$
6,631
   
$
4,002