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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
                 
 
June 30, 2019
   
December 31, 2018
 
Raw materials
  $
 36,925
    $
 37,696
 
Work-in-process
   
6,052
     
4,740
 
Finished goods
   
11,595
     
4,934
 
                 
Net balance
  $
 54,572
    $
 47,370