Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories at March 31, 2020 and December 31, 2019 consisted of the following:

(in thousands)	March 31, 2020		December 31, 2019
Raw material	$	2,788	$	3,401
Work-in-process	7,736		7,278
Finished goods	11,573		10,974
Supplies	1,057		968
Total inventories	$	23,154	$	22,621