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Inventories
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
5.
INVENTORIES
Inventory, net of write-downs, as of December 31, 2021 and 2020 were as follows (in thousands):
 
    
As of December 31,
 
    
2021
    
2020
 
Raw materials
   $ 1,544    $ 1,123
Work
in-process
     2,447      1,337
Finished goods
     94      195
  
 
 
    
 
 
 
Total inventory, net
   $ 4,085    $ 2,655
  
 
 
    
 
 
 
The Company’s inventory write-down to reduce inventories to net realizable value was $1,203 and $72 during the years ended December 31, 2021 and 2020, respectively.