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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following (in thousands):
 
December 31,
 
2017
 
2016
Raw materials
$
1,101

 
$
3,291

Work in process
383

 
790

Finished goods
1,163

 
3,044

 
$
2,647

 
$
7,125