Segment and Geographic Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 30, 2019 USD ($) segment	Mar. 31, 2018 segment	Dec. 29, 2018 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment	1	1
Total property and equipment, net	$ 36,758		$ 34,883
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	29,965		27,353
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	2,088		2,360
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	3,142		3,319
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	802		949
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	280		324
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	481		578
Foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 6,793		$ 7,530
Geographic Concentration Risk | Property, Plant and Equipment
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	100.00%		100.00%
Geographic Concentration Risk | Property, Plant and Equipment | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	82.00%		78.00%
Geographic Concentration Risk | Property, Plant and Equipment | China
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	6.00%		7.00%
Geographic Concentration Risk | Property, Plant and Equipment | Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	8.00%		9.00%
Geographic Concentration Risk | Property, Plant and Equipment | Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	2.00%		3.00%
Geographic Concentration Risk | Property, Plant and Equipment | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	1.00%		1.00%
Geographic Concentration Risk | Property, Plant and Equipment | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	1.00%		2.00%
Geographic Concentration Risk | Property, Plant and Equipment | Foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	18.00%		22.00%