Inventory (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory consisted of the following at December 31 (in thousands):

	2018		2017
Raw materials	$	3,408	$	5,743
Work in process	4,054		4,845
Finished goods	5,711		9,469
Total inventory	$	13,173	$	20,057