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Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net loss | $ (13,079)us-gaap_NetIncomeLoss | $ (12,276)us-gaap_NetIncomeLoss | $ (12,314)us-gaap_NetIncomeLoss
Other comprehensive gain (loss), net of tax: |  |  |
Change in unrealized gain (loss) on available-for-sale investments (See Note 4) | 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 11us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (124)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Total comprehensive loss | $ (13,079)us-gaap_ComprehensiveIncomeNetOfTax | $ (12,265)us-gaap_ComprehensiveIncomeNetOfTax | $ (12,438)us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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