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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 4,281 $ 5,922
Work in process 1,742 976
Finished goods 3,581 3,707
Total inventories $ 9,604 $ 10,605 [1]
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2013.