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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
(4)Inventories

 

Inventories consist of the following:

 

   As of December 31, 
   2017   2016 
Raw materials  $297   $283 
Finished goods   863    510 
    1,160    793 
Allowance for excess quantities   (21)   (21)
   $1,139   $772