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Stockholders' Equity (Schedule Of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands
 3 Months Ended
Apr. 01, 2017
USD ($)
$ / shares
shares
Number of Shares  
Options outstanding, Number of Shares, Beginning Balance | shares 8,798
Options granted, Number of Shares | shares 1,020
Options exercised, Number of Shares | shares (83)
Options expired/forfeited, Number of Shares | shares (397)
Options outstanding, Number of Shares, Ending Balance | shares 9,338
Weighted-Average Exercise Price  
Options outstanding, Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 1.46
Options granted, Weighted-Average Exercise Price | $ / shares 1.02
Options exercised, Weighted-Average Exercise Price | $ / shares 0.74
Options expired/forfeited, Weighted Average Exercise Price | $ / shares 1.66
Options outstanding, Weighted-Average Exercise Price, Ending Balance | $ / shares $ 1.41
Additional Disclosure  
Options exercisable, Aggregate Intrinsic Value | $ $ 19,000