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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Components of Inventory

The components of inventory were as follows (in thousands):

 

   2021   2020 
   As of December 31, 
   2021   2020 
Raw materials  $411   $388 
WIP   134    97 
Finished goods   52    2 
Inventory, net  $597   $487