Geographic and Significant Customer Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Total net revenues:
Total net revenues	$ 43,938	$ 58,269	$ 152,611	$ 184,784
United States [Member]
Total net revenues:
Total net revenues	6,888	13,309	32,337	36,548
Europe [Member]
Total net revenues:
Total net revenues	4,087	3,054	12,670	20,996
Japan [Member]
Total net revenues:
Total net revenues	5,896	10,912	12,746	27,173
South Korea [Member]
Total net revenues:
Total net revenues	18,554	22,986	75,663	70,603
Taiwan [Member]
Total net revenues:
Total net revenues	6,233	2,775	12,105	9,556
Other [Member]
Total net revenues:
Total net revenues	$ 2,280	$ 5,233	$ 7,090	$ 19,908