Segment and Geographic Information (Revenue by Major Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015 segment	Dec. 28, 2013	Dec. 29, 2012
Segment Reporting [Abstract]
Number of industry segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 366,127	$ 332,525	$ 279,256
Total revenue, percent	100.00%	100.00%	100.00%
United States:
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,848	28,506	34,172
Total revenue, percent	8.00%	9.00%	12.00%
Total foreign revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	335,279	304,019	245,084
Total revenue, percent	92.00%	91.00%	88.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	159,155	148,018	113,585
Total revenue, percent	43.00%	45.00%	41.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	59,041	47,459	48,202
Total revenue, percent	16.00%	14.00%	17.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	31,207	26,538	35,696
Total revenue, percent	9.00%	8.00%	13.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	6,691	6,708	8,276
Total revenue, percent	2.00%	2.00%	3.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	69,778	64,425	32,254
Total revenue, percent	19.00%	19.00%	12.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 9,407	$ 10,871	$ 7,071
Total revenue, percent	3.00%	3.00%	2.00%