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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories at December 31, 2021 and December 31, 2020, consisted of the following:
December 31,
(in thousands)20212020
Raw material$2,726$3,100
Work-in-process3,7467,079
Finished goods12,52013,288
Supplies7881,112
Total inventories$19,780$24,579