Fair Value Measurement (Details 1) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Fair Value, Earn-out liability	$ 588
Valuation Technique, Earn-out liability	Discounted cash flow
Discounted cash flow [Member]
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Weighted Average, Projected royalties	1,662
Weighted Average, Discount rate	21.99%
Discounted cash flow [Member] | Minimum [Member]
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Weighted Average, Projected royalties	414
Weighted Average, Discount rate	20.91%
Discounted cash flow [Member] | Maximum [Member]
Quantitative information about the inputs and valuation methodologies used for fair value measurements
Weighted Average, Projected royalties	$ 1,934
Weighted Average, Discount rate	27.00%