The estimated maximum amount of possible loss from the contingency.

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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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Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total rent expense, net of sublease income	$ 201,000	$ 239,000	$ 678,000	$ 710,000
Royalty Claims
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Minimum loss	25,000		25,000
Maximum loss	250,000		250,000
Wafer and Finished Goods Inventory
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases	3,200,000		3,200,000		$ 552,000
Other Goods and Services
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total outstanding purchase obligations	1,800,000		1,800,000
Purchase obligations due within the next twelve months	$ 1,600,000		$ 1,600,000