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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories at September 30, 2020 and December 31, 2019 consisted of the following:
(in thousands)September 30, 2020December 31, 2019
Raw material$3,026 $3,401 
Work-in-process8,575 7,278 
Finished goods11,619 10,974 
Supplies1,224 968 
Total inventories$24,444 $22,621