Fair Value of Financial Instruments (Details 3) (Contingent consideration, USD $)	9 Months Ended
	Sep. 29, 2012
Quantitative information for Level 3 Fair Value Measurements Liability
Label Fair value Liabilities	$ 4,004,000
Probability weighted discounted cash flow | Weighted Average
Quantitative information for Level 3 Fair Value Measurements Liability
Estimated outcomes if milestone goals are achieved	4,200,000
Estimated probability of achieving each outcome (as a percent)	15.00%
Estimated discount rate (as a percent)	5.15%
Probability weighted discounted cash flow | Minimum
Quantitative information for Level 3 Fair Value Measurements Liability
Estimated outcomes if milestone goals are achieved	100,000
Estimated probability of achieving each outcome (as a percent)	3.00%
Probability weighted discounted cash flow | Maximum
Quantitative information for Level 3 Fair Value Measurements Liability
Estimated outcomes if milestone goals are achieved	$ 7,600,000
Estimated probability of achieving each outcome (as a percent)	33.00%