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Commitments and Contingencies (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 28, 2015 | Jun. 29, 2014 | Jun. 28, 2015 | Jun. 29, 2014 | Dec. 28, 2014
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |  |  |
Total rent expense, net of sublease income | $ 238,000 | $ 240,000 | $ 477,000 | $ 471,000 |
Wafer purchase commitment |  |  |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |  |  |
Outstanding commitment for purchases | 913,000 |  | 913,000 |  | $ 552,000
Other goods and services |  |  |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |  |  |
Purchase obligation | 1,900,000 |  | 1,900,000 |  |
Purchase obligations due in twelve months | 1,600,000 |  | 1,600,000 |  |
Royalty claims |  |  |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |  |  |
Loss contingency, range of possible loss, minimum | 0 |  | 0 |  |
Loss contingency, range of possible loss, maximum | $ 250,000 |  | $ 250,000 |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 + Details
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