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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventories [Abstract]  
Schedule of Inventory
  
March 31, 2018
  
December 31, 2017
 
  
(unaudited)
    
Raw materials and work in progress
 
$
2,601
  
$
2,490
 
Finished goods
  
428
   
519
 
Total inventories
 
$
3,029
  
$
3,009