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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories at September 30, 2019 and December 31, 2018 consisted of the following:
(in thousands)September 30,
2019
December 31,
2018
Raw material$2,852  $1,286  
Work-in-process4,996  4,749  
Finished goods15,306  17,535  
Supplies1,045  1,237  
Total inventories$24,199  $24,807