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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

Amount of increase in the value of a contingent consideration liability, arising from accretion.

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Amount of increase (decrease) in the value of a contingent consideration liability, resulting from foreign currency translations.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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
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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of financial and nonfinancial obligations.

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Amount of cash outflow, made soon after acquisition date of business combination, to settle contingent consideration liability.

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