Fair Value Measurements - Quantitative Information about the Inputs and Valuation Methodologies Used for Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
Sep. 27, 2014	Dec. 28, 2013	Sep. 28, 2013	Dec. 29, 2012	Sep. 27, 2014 Level 3 Discounted Cash Flow	Sep. 27, 2014 Level 3 Discounted Cash Flow Minimum	Sep. 27, 2014 Level 3 Discounted Cash Flow Maximum
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Fair Value, Earn-out liability	$ 566	$ 624	$ 546	$ 652	$ 566
Valuation Technique, Earn-out liability					Discounted cash flow
Weighted Average, Projected royalties					$ 1,474	$ 414	$ 1,715
Weighted Average, Discount rate					21.71%	20.50%	27.00%

Fair value inputs projected royalties amount.

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- Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

+ Details

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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