Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories

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

(in thousands)	December 31, 2018	December 31, 2017
Raw materials	$40,489	$42,215
Work in process	33,181	65,448
Finished goods	12,234	28,856
Total inventories	$85,904	$136,519