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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Wafer purchase commitment [Member]	Dec. 30, 2012 Wafer purchase commitment [Member]	Mar. 31, 2013 Other goods and services [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases			$ 3,500	$ 621	$ 799
Total rent expense, net of sublease income	$ 233	$ 125

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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