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Description Of Business (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2013
Dec. 29, 2012
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Dec. 29, 2012
Ascendiant Capital Markets LLC [Member]
Dec. 31, 2011
Ascendiant Capital Markets LLC [Member]
Class of Stock [Line Items]              
Net loss $ (2,863,000)   $ (3,980,000) $ (6,033,000) $ (5,061,000)    
Accumulated deficit (92,754,000) (86,721,000)   (92,754,000)      
Net cash used in operating activities       (530,000) (2,669,000)    
Proceeds from public offering, net   $ 1,300,000   $ 28,000 $ 3,618,000 $ 3,900,000 $ 1,900,000