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Commitments and Contingencies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Wafer purchase commitment [Member]
Dec. 30, 2012
Wafer purchase commitment [Member]
Sep. 29, 2013
Other goods and services [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]              
Outstanding commitment for purchases         $ 8,500 $ 621 $ 609
Total rent expense, net of sublease income $ 234 $ 120 $ 726 $ 370