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Cost of sales (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of cost of sales [abstract]  
Schedule of Cost of Sales
The following are components of cost of sales:

 
  
Three-month
    
Three-month
    
Nine-month
    
Nine-month
  
 
  
period ended
    
period ended
    
period ended
    
period ended
  
 
  
September 30,
    
September 30,
    
September 30,
    
September 30,
  
 
  
2018
    
2017
    
2018
    
2017
  
 
                        
Salaries and employee benefits
  
$
6,119
    
$
5,277
    
$
17,599
    
$
16,544
  
Raw materials and consumables
    
4,754
      
2,560
      
14,034
      
10,105
  
Utilities
    
1,237
      
772
      
3,246
      
3,006
  
Other costs
    
447
      
343
      
1,948
      
1,931
  
Changes in inventories
    
252
      
(1,258
)
    
1,116
      
(1,229
)
 
  
$
12,809
    
$
7,694
    
$
37,943
    
$
30,357