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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventories [Abstract]  
Inventories
Inventories consist of:
 
  
March 31, 2020
  
December 31, 2019
 
Raw materials and work-in-process
 
$
2,813
  
$
2,651
 
Finished goods
  
658
   
376
 
Total inventories
 
$
3,471
  
$
3,027