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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory [Abstract]  
Schedule of Inventories

Inventories consisted of the following (in thousands):



 September 30, 2018 
 December 31, 2017 

Finished goods

 $  642  
 $  288  
Components   137  
  47  

Total

 $  779  
 $  335