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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories as of December 31 were as follows (in thousands):
 
    
2020
    
2019
 
Raw materials
   $ 42,556      $ 35,901  
Work-in-process
     7,424        5,184  
Finished goods
     7,289        8,102  
    
 
 
    
 
 
 
     $ 57,269      $ 49,187