Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2016	Apr. 03, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 1,184	$ 1,119
Amortization expense – operating expenses	2,108	1,889
Total amortization expense	$ 3,292	$ 3,008