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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories consist of the following (in thousands):
 
June 30,
2018
 
December 31,
2017
 
 
 
 
Purchased materials
$
622

 
$
148

Finished goods
2,329

 
3,103

 
$
2,951

 
$
3,251