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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
 
September 30, 2019
 
 
 
 
December 31, 2018
 
Raw materials
  $
  35,907
    $
  37,696
 
Work-in-process
   
4,854
     
4,740
 
Finished goods
   
8,927
     
4,934
 
                 
Net balance
  $
  49,688
    $
  47,370