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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following (in thousands):

 

   March 31, 2022   December 31, 2021 
Raw materials  $4,455   $3,642 
Work in process   830    133 
Finished goods   1,782    2,823 
Reserve for excess and obsolescence   (2,217)   (2,165)
Total inventory  $4,850   $4,433