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6. INVENTORY (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Components of Inventory

Inventory consists of the following:

             
      March 31,     December 31,
(in thousands)     2022     2021
Raw materials   $                   1,815   $                      1,780

 

  $                   1,815   $                      1,780