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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories consist of the following (in thousands):
 
March 31,
2017
 
December 31,
2016
 
 
 
 
Purchased materials
$
107

 
$
148

Finished goods
2,409

 
2,422

 
$
2,516

 
$
2,570