Segment and Geographic Information (Revenue by Major Geographic Area) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 427,054	$ 405,966	$ 366,127
Total revenue, percent	100.00%	100.00%	100.00%
United States:
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 51,752	$ 33,677	$ 30,848
Total revenue, percent	12.00%	8.00%	8.00%
Total foreign revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 375,302	$ 372,289	$ 335,279
Total revenue, percent	88.00%	92.00%	92.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 146,645	$ 147,688	$ 159,155
Total revenue, percent	34.00%	36.00%	43.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 59,835	$ 55,596	$ 59,041
Total revenue, percent	14.00%	14.00%	16.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 49,080	$ 44,067	$ 31,207
Total revenue, percent	12.00%	11.00%	9.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 31,322	$ 31,181	$ 6,691
Total revenue, percent	7.00%	8.00%	2.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 78,046	$ 85,598	$ 69,778
Total revenue, percent	18.00%	21.00%	19.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 10,374	$ 8,159	$ 9,407
Total revenue, percent	3.00%	2.00%	3.00%