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Inventories
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
3.
  Inventories
Inventories as of December 31 were as follows (in thousands):
 
2019
 
 
2018
 
Raw materials
  $
35,901
    $
37,696
 
Work-in-process
   
5,184
     
4,740
 
Finished goods
   
8,102
     
4,934
 
                 
 
  $
49,187
    $
47,370