Segment and Geographic Information (Revenue by Major Geographic Area) (Details) $ in Thousands	12 Months Ended
	Jan. 02, 2016 USD ($) segment	Jan. 03, 2015 USD ($)	Dec. 28, 2013 USD ($)
Segment Reporting [Abstract]
Number of industry segments | segment	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 405,966	$ 366,127	$ 332,525
Total revenue, percent	100.00%	100.00%	100.00%
United States:
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 33,677	$ 30,848	$ 28,506
Total revenue, percent	8.00%	8.00%	9.00%
Total foreign revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 372,289	$ 335,279	$ 304,019
Total revenue, percent	92.00%	92.00%	91.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 147,688	$ 159,155	$ 148,018
Total revenue, percent	36.00%	43.00%	45.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 55,596	$ 59,041	$ 47,459
Total revenue, percent	14.00%	16.00%	14.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 44,067	$ 31,207	$ 26,538
Total revenue, percent	11.00%	9.00%	8.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 31,181	$ 6,691	$ 6,708
Total revenue, percent	8.00%	2.00%	2.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 85,598	$ 69,778	$ 64,425
Total revenue, percent	21.00%	19.00%	19.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 8,159	$ 9,407	$ 10,871
Total revenue, percent	2.00%	3.00%	3.00%