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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventories [Abstract]  
Inventory
  
September 30, 2018
  
December 31, 2017
 
  
 
    
Raw materials and work in progress
 
$
2,391
  
$
2,490
 
Finished goods
  
97
   
519
 
Total inventories
 
$
2,488
  
$
3,009