Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 985	$ 1,174	$ 2,169	$ 2,293
Amortization expense – operating expenses	1,979	1,852	4,087	3,741
Total amortization expense	$ 2,964	$ 3,026	$ 6,256	$ 6,034