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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 | Jun. 28, 2014 | Dec. 28, 2013
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Earn-Out liability |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements | $ 551 | $ 624
Level 2 | Earn-Out liability |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements |  |
Level 3 | Earn-Out liability |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements | 551 | 624
Money market funds |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements | 12,245 | 12,742
Money market funds | Level 1 |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements | 12,245 | 12,742
Money market funds | Level 2 |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements |  |

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

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

X
- 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