Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 5,095	$ 4,167	$ 3,913	$ 4,242
Balance assumed from TVN acquisition	0		1,012
Accrual for current period warranties	1,552	1,182	4,527	4,308
Product Warranty Accrual, Preexisting, Increase (Decrease)	(99)	0	(173)	(93)
Warranty costs incurred	(1,469)	(1,448)	(4,200)	(4,556)
Balance at end of period	$ 5,079	$ 3,901	$ 5,079	$ 3,901