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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventories [Abstract]  
Inventories
Inventories consist of:
 
   
September 30, 2021
   
December 31, 2020
 
Raw materials and work-in-process
 
$
3,024
   
$
2,949
 
Finished goods
   
201
     
495
 
Total inventories
 
$
3,225
   
$
3,444