Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories are comprised of the following amounts:

	As of December 31,
	2017		2016
Raw materials	$	37,337	$	36,080
Work in process		27,669		22,645
Finished goods		17,611		8,412
Inventories	$	82,617	$	67,137