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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories as of December 31 were as follows (in thousands):
 
 
  
2021
 
  
2020
 
Raw materials
   $ 51,289      $ 42,556  
Work-in-process
     12,514        7,424  
Finished goods
     3,519        7,289  
    
 
 
    
 
 
 
     $ 67,322      $ 57,269