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INVENTORIES
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
INVENTORIES
6.
INVENTORIES
Inventories as of December 31, 2021 and 2020 consisted of the following:
 
    
December 31,
 
    
2021
    
2020
 
Raw materials
   $ 21,517      $ 14,023  
Work in process
     24,166        12,112  
Finished goods
     2,221        —    
    
 
 
    
 
 
 
Total inventories
   $ 47,904      $ 26,135