Segment and Geographic Information (Details) $ in Thousands	3 Months Ended
	Apr. 02, 2016 USD ($) segment	Apr. 04, 2015 USD ($)	Jan. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment	2
Number of reportable segments | segment	1
Total revenue	$ 96,512	$ 88,597
Total revenue as percentage	100.00%	100.00%
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 65,512	$ 62,534
Total revenue as percentage	68.00%	70.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 16,009	$ 16,467
Total revenue as percentage	17.00%	19.00%
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 14,991	$ 9,596
Total revenue as percentage	15.00%	11.00%
Qterics
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, percent	0.40%	0.20%
Net Loss, percent	4.10%	0.40%
Assets, percent	0.30%		0.80%