Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 2,311	$ 2,480
Amortization expense – operating expenses	3,998	3,698
Total amortization expense	$ 6,309	$ 6,178