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Supplemental Financial Information (Schedule Of Warranty Liability Activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Supplemental Financial Information    
Beginning balance $ 152 $ 89
Estimated cost of warranty claims charged to cost of sales 155 97
Cost of actual warranty claims (131) (73)
Ending balance 176 113
Less current portion (106) (68)
Long-term warranty liability $ 70 $ 45