Segment and Geographic Information - Property and Equipment, Net by Country (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 40,423	$ 49,481	$ 51,852
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	30,338	30,532	25,615
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,632	10,617	14,998
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,883	4,928	3,948
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	958	2,310	3,677
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	0	215	1,470
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	313	637	1,211
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	299	242	933
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 10,085	$ 18,949	$ 26,237