Inventory

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventory

Inventory

Inventory includes material, labor and overhead, and is stated at lower of cost (first-in, first-out) or market (net realizable value). The components of inventory are as follows (in thousands):

	March 31, 2018		December 31, 2017
Purchased components	$	15,162	$	14,947
Work in process	14,849		13,433
Finished goods	22,107		20,832
Total	$	52,118	$	49,212