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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Money market funds [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Assets, Fair Value Measurements	$ 10,839	$ 10,839
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	10,839
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
Money market funds [Member] | Level 3 [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	588	652
Earn-out liability [Member] | Level 1 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Liabilities, Fair Value Measurements
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	$ 588	$ 652

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