INVENTORY (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Summary of Components of Inventory

The following table summarizes the components of the Company’s inventory for each of the periods indicated:

	As of December 31, 2018		As of December 31, 2017
	(in thousands)
Raw materials	$	71,313	$	53,875
Work in progress		47,279		27,442
Finished goods		6,853		2,288
Total inventory	$	125,445	$	83,605