Inventory (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory were as follows:

	September 30, 2018		December 31, 2017
	(in thousands)
Raw materials	$	866	$	1,389
Work-in-progress	—		3,608
Finished goods	—		562
Total	$	866	$	5,559