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Stockholders' Equity (Schedule Of Common Stock Options Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Stockholders' Equity [Abstract]  
Options outstanding, Number of Shares, Beginning Balance 4,752
Options granted, Number of Shares 1,370
Options exercised, Number of Shares (79)
Options cancelled, Number of Shares (260)
Options outstanding, Number of Shares, Ending Balance 5,783
Options outstanding, Weighted-Average Exercise Price, Beginning Balance $ 3.22
Options granted, Weighted-Average Exercise Price $ 0.71
Options exercised, Weighted-Average Exercise Price $ 0.30
Options cancelled, Weighted Average Exercise Price $ 2.19
Options outstanding, Weighted-Average Exercise Price, Ending Balance $ 3.20