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Debt (Schedule Of Interest Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Interest expense:        
Interest expense $ 135 $ 141 $ 284 $ 295
Interest income (2) (3) (4) (9)
Interest expense, net 133 138 280 286
Silicon Valley Bank        
Interest expense:        
Interest expense 6 8 24 21
SVIC Senior Secured Convertible Promissory Note        
Interest expense:        
Interest expense 128 129 257 258
Others        
Interest expense:        
Interest expense $ 1 $ 4 $ 3 $ 16