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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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