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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories at June 30, 2017 and December 31, 2016 consisted of the following:

(in thousands)
June 30,
2017
December 31, 2016
Raw material
$
1,371

$
1,649

Work-in-process
8,706

7,963

Finished goods
7,372

5,132

Supplies
771

723

Total inventories
$
18,220

$
15,467