Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories

As of March 31, 2018 and December 31, 2017, inventories consisted of the following:

(in thousands)	March 31,  2018	December 31, 2017
Raw materials	$42,411	$42,215
Work in process	44,184	65,448
Finished goods	13,439	28,856
Total inventories	$100,034	$136,519