Inventories (Tables)

6 Months Ended

Jun. 28, 2014

Inventory Disclosure [Abstract]

Component of inventories

Inventories consist of the following as of the following dates (in thousands):

	June 28, 2014		December 28, 2013
Raw materials and sub-assemblies	$	20,754	$	19,655
Work in process	8,943		7,597
Finished goods	8,056		7,268
Inventories	37,753		34,520
Inventories-delivered systems	358		6,901
Total inventories	$	38,111	$	41,421