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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventories [Abstract]  
Inventories
Inventories consist of:
 
  
March 31, 2019
  
December 31, 2018
 
       
Raw materials and work in progress
 
$
2,872
  
$
2,442
 
Finished goods
  
249
   
352
 
Total inventories
 
$
3,121
  
$
2,794