Inventory

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventory

Inventory

Inventory includes material, labor and overhead. The components of inventory are as follows (in thousands):

	December 31,
	2017		2016
Purchased components	$	14,947	$	14,967
Work in process	13,433		13,939
Finished goods	20,832		17,939
	$	49,212	$	46,845