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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of components of inventories
The components of inventories are as follows (in thousands):
 
December 31,
 
2017
 
2016
Raw materials
$
16,500

 
$
11,742

Work-in-process
8,371

 
11,621

Finished goods
16,540

 
7,915

  Total
$
41,411

 
$
31,278