Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories by Type

Inventories consisted of the following:

	As of December 31,
	2017		2016
	(in thousands)
Raw materials	$	20,924	$	6,348
Work-in-process	74,237		56,672
Finished goods	16,669		14,584
Total	$	111,830	$	77,604