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Summary Of Significant Accounting Policies (Schedule Of Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency contracts included in prepaid expenses and other current assets | $ 4 |
Total financial assets and liabilities | 27,921 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds included in cash equivalents | 27,917 | $ 14,460
Foreign currency contracts included in prepaid expenses and other current assets |  | 33
Total financial assets and liabilities |  | 14,493
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial assets and liabilities | 27,917 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds included in cash equivalents | 27,917 | 14,460
Total financial assets and liabilities |  | 14,460
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency contracts included in prepaid expenses and other current assets | 4 |
Total financial assets and liabilities | $ 4 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency contracts included in prepaid expenses and other current assets |  | 33
Total financial assets and liabilities |  | $ 33

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