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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

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