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Inventory (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
Inventories consisted of the following at December 31 (in thousands):

20212020
Raw materials$1,343 $4,891 
Work in process1,625 1,942 
Finished goods2,099 2,383 
Inventory$5,067 $9,216