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Debt (Schedule Of Interest Expense Related To Long-Term Debt) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Interest expense:    
Interest expense $ 154 $ 141
Interest income (6) (4)
Interest expense, net 148 137
Silicon Valley Bank    
Interest expense:    
Interest expense 13 11
SVIC Senior Secured Convertible Promissory Note    
Interest expense:    
Interest expense 129 129
Others    
Interest expense:    
Interest expense $ 12 $ 1