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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories at December 31, 2019 and December 31, 2018, consisted of the following:
 
(in thousands)December 31, 2019December 31, 2018
Raw material$3,401  $1,286  
Work-in-process7,278  4,749  
Finished goods10,974  17,535  
Supplies968  1,237  
Total inventories$22,621  $24,807