Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories by Type

Inventories consisted of the following:

	As of December 31,
	2018		2017
	(in thousands)
Raw materials	$	9,677	$	20,924
Work-in-process	87,944		74,237
Finished goods	26,739		16,669
Total	$	124,360	$	111,830