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Inventory (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following at September 30, 2021 and December 31, 2020 (in thousands):

September 30,December 31,
20212020
Raw materials$5,227 $4,891 
Work in process2,377 1,942 
Finished goods2,128 2,383 
$9,732 $9,216