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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were as follows (in thousands):
 
     September 30, 2021      December 31, 2020  
               
Raw materials
   $  46,912      $  42,556  
Work-in-process
     11,207        7,424  
Finished goods
     5,290        7,289  
 
 
 
 
 
 
 
 
 
     $ 63,409      $ 57,269