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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
--- | --- | ---
Money market funds [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements | $ 10,839 | $ 10,133
Money market funds [Member] | Level 1 [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements | 10,839 | 10,133
Money market funds [Member] | Level 2 [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Assets, Fair Value Measurements |  |
Earn-out liability [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements | 652 | 765
Earn-out liability [Member] | Level 2 [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements |  |
Earn-out liability [Member] | Level 3 [Member] |  |
Financial assets and liabilities measured and recognized at fair value on a recurring basis |  |
Liabilities, Fair Value Measurements | $ 652 | $ 765

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