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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories consist of the following (in thousands):
 
September 30,
2017
 
December 31,
2016
 
 
 
 
Purchased materials
$
135

 
$
148

Finished goods
2,617

 
2,422

 
$
2,752

 
$
2,570