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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories at December 31, 2018 and December 31, 2017, consisted of the following:
 
(in thousands)December 31, 2018December 31, 2017
Raw material$1,286 $2,148 
Work-in-process4,749 6,585 
Finished goods17,535 14,647 
Supplies1,237 729 
Total inventories$24,807 $24,109