Inventory (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Inventory

Inventory consisted of the following at December 31, 2018 and 2017 (in thousands).

	2018		2017
Finished goods	$	347	$	2,270
Work-in-process		6,375		529
Raw materials and supplies		58,857		66,368
Inventory	$	65,579	$	69,167