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Supplemental Financial Information (Schedule Of Computation Of Net Loss Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Dec. 31, 2016
Basic and diluted net loss per share:            
Numerator: Net loss $ (3,417) $ (3,847) $ (8,090) $ (7,189) $ 13,400 $ 11,200
Denominator: Weighted-average common shares outstanding, basic and diluted 91,685 61,844 87,073 61,763    
Basic and diluted net loss per share $ (0.04) $ (0.06) $ (0.09) $ (0.12)    
Common share equivalents 12,627 13,006 12,628 13,155