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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Classes of current inventories [abstract]  
Schedule of Inventories
 
  
December 31,
    
December 31,
  
 
  
2017
    
2016
  
 
            
Concentrates
  
$
1,391
    
$
1,266
  
Ore stockpiles
    
2,877
      
161
  
Spare parts and supplies
    
5,098
      
5,191
  
 
  
$
9,366
    
$
6,618