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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
 
     March 31, 2021      December 31, 2020  
Raw materials
   $ 39,924      $ 42,556  
Work-in-process
     9,271        7,424  
Finished goods
     5,061        7,289  
    
 
 
    
 
 
 
     $ 54,256      $ 57,269