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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
6. INVENTORIES
Inventories as of December 31 were as follows (in thousands):
 
 
 
2018
 
 
2017
 
Raw materials
 
$
37,696
 
 
$
27,400
 
Work-in-process
 
 
4,740
 
 
 
3,596
 
Finished goods
 
 
4,934
 
 
 
5,503
 
Net balance
 
$
47,370
 
 
$
36,499