Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2015	Jun. 28, 2015	Dec. 28, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ (600)	$ (1,100)
Other intangible assets, accumulated amortization	(1,709)	(1,709)	$ (615)
Other intangible assets, net	16,166	16,166	16,760
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	17,875	17,875	17,375
Patents and Purchased Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	13,675	13,675	13,675
Other intangible assets, accumulated amortization	(1,584)	(1,584)	(615)
Other intangible assets, net	12,091	12,091	13,060
Purchased In-Process Research and Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	3,700	3,700	3,700
Other intangible assets, accumulated amortization	0	0	0
Other intangible assets, net	3,700	3,700	$ 3,700
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	500	500
Other intangible assets, accumulated amortization	(125)	(125)
Other intangible assets, net	$ 375	$ 375