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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories at December 31, 2020 and December 31, 2019, consisted of the following: 
(in thousands)December 31, 2020December 31, 2019
Raw material$3,100 $3,401 
Work-in-process7,079 7,278 
Finished goods13,288 10,974 
Supplies1,112 968 
Total inventories$24,579 $22,621