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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
   December 31, 
   2018   2017 
Raw materials   $2,581   $1,869 
Work in process    1,573    1,793 
Finished goods    2,569    2,684 
    6,723    6,346 
Less current inventory    (6,172)   (5,496)
   $551   $850