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Description Of Business (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 30, 2013
Dec. 29, 2012
Mar. 31, 2012
Dec. 29, 2012
Ascendiant Capital Markets LLC [Member]
Dec. 31, 2011
Ascendiant Capital Markets LLC [Member]
Class of Stock [Line Items]          
Net loss $ (3,170)   $ (1,081)    
Accumulated deficit (89,891) (86,721)      
Net cash used in operating activities (58)   208    
Proceeds from public offering, net   $ 1,300 $ 3,573 $ 3,900 $ 1,900