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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014 Wafer purchase commitment [Member]	Dec. 29, 2013 Wafer purchase commitment [Member]	Sep. 28, 2014 Other goods and services [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases					$ 569	$ 10,800	$ 1,900
Total rent expense, net of sublease income	$ 239	$ 234	$ 710	$ 726

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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