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Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 29, 2018 | Dec. 30, 2017 | Sep. 29, 2018 | Dec. 30, 2017
Level 1 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Total Assets |  |  | $ 29 | $ 5,006
Level 1 | Money market funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents |  |  | 29 | 5,006
Level 3 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Contingent consideration liability | $ 5,137 | $ 549 | 5,564 | 5,137
Total Liabilities |  |  | $ 5,564 | $ 5,137
Summary of changes in contingent consideration liabilities |  |  |  |
Beginning balance | 5,137 | 549 |  |
Acquisitions |  | 2,357 |  |
Remeasurement of acquisition-related contingent consideration | (281) | 1,155 |  |
Accretion | 708 | 1,328 |  |
Payments |  | (299) |  |
Effect of foreign currency translation |  | 47 |  |
Ending balance | $ 5,564 | $ 5,137 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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