Income Taxes (Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Deferred tax assets:
Net operating losses	$ 42,049	$ 38,594
Capital losses	5,143	4,530
Accruals and reserves	2,247	2,848
Credits carryforward	5,455	5,433
Depreciation and amortization	10,709	10,590
Stock-based compensation	1,078	1,583
Deferred tax assets, gross	66,681us-gaap_DeferredTaxAssetsGross	63,578us-gaap_DeferredTaxAssetsGross
Valuation allowances	(66,618)	(63,528)
Deferred tax asset	63us-gaap_DeferredTaxAssetsLiabilitiesNet	50us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax liability	$ 0us-gaap_DeferredTaxLiabilities	$ 0us-gaap_DeferredTaxLiabilities

Deferred Tax Assets, Operating Losses and Capital Losses Carryforwards

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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