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Inventories
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories InventoriesInventories at March 31, 2019 and December 31, 2018 consisted of the following:
(in thousands)March 31,
2019
December 31,
2018
Raw material$1,870 $1,286 
Work-in-process4,633 4,749 
Finished goods14,896 17,535 
Supplies1,042 1,237 
Total inventories$22,441 $24,807