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Inventories
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories at June 30, 2019 and December 31, 2018 consisted of the following:

(in thousands)June 30,
2019
December 31,
2018
Raw material$3,656 $1,286 
Work-in-process4,060 4,749 
Finished goods16,082 17,535 
Supplies1,116 1,237 
Total inventories$24,914 $24,807