Fair Value Measurement - Financial Assets and Liabilities Measured and Recognized at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Money Market Funds
Assets:
Assets, Fair Value Measurements	$ 20,950	$ 8,270
Earn Out Liability
Liabilities:
Liabilities, Fair Value Measurements	572	694
Level 1 \| Money Market Funds
Assets:
Assets, Fair Value Measurements	20,950	8,270
Level 3 \| Earn Out Liability
Liabilities:
Liabilities, Fair Value Measurements	$ 572	$ 694

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

No definition available.

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant