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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Component of inventories
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

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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