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Stock-Based Awards (Schedule Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Number of Shares    
Options outstanding, Number of Shares, Beginning Balance 8,186  
Options granted, Number of Shares 790  
Options exercised, Number of Shares (175)  
Options expired/forfeited, Number of Shares (1,444)  
Options outstanding, Number of Shares, Ending Balance 7,357 8,186
Weighted-Average Exercise Price    
Options outstanding, Weighted-Average Exercise Price, Beginning Balance $ 1.18  
Options granted, Weighted-Average Exercise Price 0.35  
Options exercised, Weighted-Average Exercise Price 0.28  
Options expired/forfeited, Weighted Average Exercise Price 0.89  
Options outstanding, Weighted-Average Exercise Price, Ending Balance $ 1.17 $ 1.18
Options outstanding, Weighted-Average Remaining Contractual Life 5 years 6 months 15 days 5 years 10 months 17 days
Options outstanding, Aggregate Intrinsic Value $ 127,000 $ 223,000
Options exercisable, Number of Shares 5,799  
Options exercisable, Weighted-Average Exercise Price $ 1.37  
Options exercisable, Weighted-Average Remaining Contractual Life 4 years 8 months 9 days  
Additional Disclosure    
Options exercisable, Aggregate Intrinsic Value $ 49,000  
Options exercisable and expected to vest, Number of Shares 7,097  
Options exercisable and expected to vest, Weighted-Average Exercise Price $ 1.20  
Options exercisable and expected to vest, Weighted-Average Remaining Contractual Life 5 years 4 months 28 days  
Options exercisable and expected to vest, Aggregate Intrinsic Value $ 114,000