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Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase obligation	$ 1,200,000
Total rent expense, net of sublease income	947,000us-gaap_OperatingLeasesRentExpenseNet	947,000us-gaap_OperatingLeasesRentExpenseNet	493,000us-gaap_OperatingLeasesRentExpenseNet
Wafer purchase commitment [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases	$ 552,000	$ 10,800,000

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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