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Inventory, net
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventory, net
8. Inventory, net
Inventory, net consisted of the following (in thousands):
 
    
As of December 31,
 
    
2021
    
2020
 
Finished goods
   $ 3,264      $ 2,756  
Raw materials
     64        —    
Work in process
     50        —    
Less: Inventory reserve
     (16      (20
    
 
 
    
 
 
 
Inventory, net
   $ 3,362      $ 2,736