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Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Level 1
Fair Value of Financial Instruments
Total Assets			$ 5,006	$ 10,024
Level 1 | Money market funds
Fair Value of Financial Instruments
Cash and cash equivalents			5,006	10,024
Level 3
Fair Value of Financial Instruments
Contingent consideration liability	$ 549	$ 773	5,137	549
Total Liabilities			$ 5,137	$ 549
Summary of changes in contingent consideration liability
Beginning balance	549	773
Acquisitions	2,357
Remeasurement of acquisition-related contingent consideration	1,155	71
Accretion	1,328
Payments	(299)	(292)
Effects of foreign currency translation	47	(3)
Ending balance	$ 5,137	$ 549

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

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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
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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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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