Fair Value Measurement (Details 1) (Level 3, Discounted Cash Flow, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Fair Value, Earn-out liability	$ 624	$ 652
Valuation Technique, Earn-out liability	Discounted cash flow	Discounted cash flow
Weighted Average, Projected royalties	1,463	1,762
Weighted Average, Discount rate	21.61%	21.84%
Minimum
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Weighted Average, Projected royalties	414	631
Weighted Average, Discount rate	20.52%	20.85%
Maximum
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Weighted Average, Projected royalties	$ 1,675	$ 1,980
Weighted Average, Discount rate	27.00%	27.00%