Balance Sheet Components - Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands		Mar. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued employee compensation and related expenses		$ 15,709	$ 16,414
Accrued TVN VDP, current (1)	[1]	2,864	3,186
Accrued warranty		4,522	4,381
Customer deposits		3,702	5,020
Contingent inventory reserves		3,480	3,806
Accrued royalty payments		2,482	2,195
Others		16,443	13,703
Accrued Liabilities, Current		$ 49,202	$ 48,705

[1] See Note 8, “Restructuring and related charges-TVN VDP,” for additional information on the Company’s TVN VDP liabilities.