Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Components of inventories

Inventories as of December 31, 2017 and 2016 include the costs of material, labor, and factory overhead. Components of inventories consist of the following:

	December 31,
	2017		2016
Raw materials	$	13,347	$	10,606
Work in process	2,137		2,185
Finished goods	7,248		7,954
	$	22,732	$	20,745