Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories at March 31, 2017 and December 31, 2016 consisted of the following:

(in thousands)	March 31, 2017		December 31, 2016
Raw material	$	1,515	$	1,649
Work-in-process	8,757		7,963
Finished goods	5,198		5,132
Supplies	686		723
Total inventories	$	16,156	$	15,467