Fair Value of Financial Instruments - Cross Licensing Liability (Details) (Level 3, Fair Value, Measurements, Nonrecurring [Member], Estimate of Fair Value, Fair Value Disclosure [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014
Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Incremental borrowing rate	9.00%
Fair Value Inputs, Discount Rate, Second Cross-Licensing Agreement	5.00%
Cross-licensing liability	$ 14,449
Cross-licensing Liability, Fair Value Disclosure, Current Portion	$ 3,140