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Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | $ 76,819 | $ 23,348 | $ 36,312 | $ 28,548
Short-term investments | 1,327 | 2,015 |  |
Long-term investments | 10,677 | 10,479 |  |
Amortized cost basis of debt securities | 12,202 | 12,660 |  |
Debt securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term investments | 1,327 | 2,015 |  |
Long-term investments | 10,677 | 10,479 |  |
Cash and money market accounts |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | 76,819 | 23,348 |  |
Short-term investments | 0 | 0 |  |
Long-term investments | $ 0 | $ 0 |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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