Inventory (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventory consists of the following at June 30, 2018 and December 31, 2017:

(in thousands)	June 30, 2018		December 31, 2017
Raw materials	$	1,493	$	469
Work in process	43,761		25,160
Finished goods	3,330		3,066
Total inventory	$	48,584	$	28,695