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Stockholders' Equity (Schedule Of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands
 6 Months Ended
Jul. 01, 2017
USD ($)
$ / shares
shares
Number of Shares  
Options outstanding, Number of Shares, Beginning Balance | shares 8,798
Options granted, Number of Shares | shares 1,230
Options exercised, Number of Shares | shares (217)
Options expired/forfeited, Number of Shares | shares (534)
Options outstanding, Number of Shares, Ending Balance | shares 9,277
Weighted-Average Exercise Price  
Options outstanding, Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 1.46
Options granted, Weighted-Average Exercise Price | $ / shares 1.04
Options exercised, Weighted-Average Exercise Price | $ / shares 0.72
Options expired/forfeited, Weighted Average Exercise Price | $ / shares 1.13
Options outstanding, Weighted-Average Exercise Price, Ending Balance | $ / shares $ 1.40
Additional Disclosure  
Options exercisable, Aggregate Intrinsic Value | $ $ 60,000