Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 994	$ 1,175	$ 3,163	$ 3,468
Amortization expense – operating expenses	2,066	1,852	6,153	5,593
Total amortization expense	$ 3,060	$ 3,027	$ 9,316	$ 9,061