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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2013
Dec. 29, 2012
Components of inventories    
Raw materials and work in process $ 6,318 $ 5,357
Finished goods 3,680 2,678
Total inventories $ 9,998 $ 8,035 [1]
[1] Derived from the audited consolidated financial statements included in the annual report filed on Form 10-K with the SEC for the year ended December 29, 2012.