Segment and Geographic Information (Revenue by Major Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012 segment	Dec. 31, 2011	Jan. 01, 2011
Segment Reporting [Abstract]
Number of industry segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
United States	$ 34,172	$ 44,847	$ 36,211
United States as percent of total	12.00%	14.00%	12.00%
Revenue from foreign external customers	245,084	273,519	261,557
Revenue from foreign external customers as percent of total	88.00%	86.00%	88.00%
Total revenue	279,256	318,366	297,768
Total revenue, percent	100.00%	100.00%	100.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	113,585	123,124	124,910
Revenue from foreign external customers as percent of total	41.00%	39.00%	42.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	48,202	66,319	54,332
Revenue from foreign external customers as percent of total	17.00%	21.00%	18.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	35,696	36,961	38,992
Revenue from foreign external customers as percent of total	13.00%	11.00%	13.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	8,276	8,346	8,839
Revenue from foreign external customers as percent of total	3.00%	3.00%	3.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	32,254	32,687	27,853
Revenue from foreign external customers as percent of total	11.00%	10.00%	10.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from foreign external customers	$ 7,071	$ 6,082	$ 6,631
Revenue from foreign external customers as percent of total	3.00%	2.00%	2.00%