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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories as of December 31, 2017 and 2016 consisted of:
 
 
2017
 
2016
 
 
(in thousands)
Raw materials
 
$
8,231

 
$
6,834

Work in progress
 
616

 
—

Finished goods
 
8,532

 
6,284

Reserve for obsolescence
 
(1,304
)
 
(410
)
 
 
$
16,075

 
$
12,708