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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
 
    
June 30, 2021
    
December 31, 2020
 
Raw materials
   $ 42,530      $ 42,556  
Work-in-process
     10,101        7,424  
Finished goods
     4,498        7,289  
    
 
 
    
 
 
 
     $ 57,129      $ 57,269