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Stock-Based Awards (Schedule Of Stock Option Activity) (Details)
shares in Thousands
 9 Months Ended
Sep. 28, 2019
$ / shares
shares
Number of Shares  
Options outstanding, Number of Shares, Beginning Balance | shares 8,186
Options granted, Number of Shares | shares 595
Options exercised, Number of Shares | shares (62)
Options expired/forfeited, Number of Shares | shares (1,182)
Options outstanding, Number of Shares, Ending Balance | shares 7,537
Weighted-Average Exercise Price  
Options outstanding, Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 1.18
Options granted, Weighted-Average Exercise Price | $ / shares 0.35
Options exercised, Weighted-Average Exercise Price | $ / shares 0.36
Options expired/forfeited, Weighted Average Exercise Price | $ / shares 1.02
Options outstanding, Weighted-Average Exercise Price, Ending Balance | $ / shares $ 1.15