Inventories (Tables)

9 Months Ended

Sep. 27, 2014

Inventory Disclosure [Abstract]

Component of inventories

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

	September 27, 2014		December 28, 2013
Raw materials and sub-assemblies	$	18,836	$	19,655
Work in process	6,366		7,597
Finished goods	10,560		7,268
Inventories	35,762		34,520
Inventories-delivered systems	501		6,901
Total inventories	$	36,263	$	41,421