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Fair Value Measurements - Financial Assets and Liabilities Measured and Recognized at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 28, 2013
--- | --- | ---
Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | $ 11,846 | $ 12,742
Level 1 | Money Market Funds |  |
Assets: |  |
Assets, Fair Value Measurements | 11,846 | 12,742
Earn Out Liability |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | 566 | 624
Earn Out Liability | Level 3 |  |
Liabilities: |  |
Liabilities, Fair Value Measurements | $ 566 | $ 624

X
- Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant