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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
 
 
 
March 31, 2019
 
 
December 31, 2018
 
Raw materials
 
$
37,205
 
 
$
37,696
 
Work-in-process
 
 
6,386
 
 
 
4,740
 
Finished goods
 
 
7,998
 
 
 
4,934
 
Net balance
 
$
51,589
 
 
$
47,370