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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2014
Dec. 30, 2013
Deferred tax assets [Abstract]    
Net operating loss carryforward $ 96,350us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 89,488us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Depreciation expense and impairment of long-lived assets 13,747cosi_DeferredTaxAssetsPropertyPlantAndEquipmentAndImpairmentOfLonglivedAssets 14,215cosi_DeferredTaxAssetsPropertyPlantAndEquipmentAndImpairmentOfLonglivedAssets
Contractual lease increases and other 529cosi_DeferredTaxAssetsContractualLeaseIncrease 851cosi_DeferredTaxAssetsContractualLeaseIncrease
Deferred franchise revenue 1,203us-gaap_DeferredTaxAssetsDeferredIncome 1,244us-gaap_DeferredTaxAssetsDeferredIncome
Stock-based compensation 1,293us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,161us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Lease termination accrual 158cosi_DeferredTaxAssetsLeaseTerminationAccrual 60cosi_DeferredTaxAssetsLeaseTerminationAccrual
Allowance for doubtful accounts 462us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 315us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Total deferred tax assets 113,742us-gaap_DeferredTaxAssetsGross 107,334us-gaap_DeferredTaxAssetsGross
Valuation allowance (113,742)us-gaap_DeferredTaxAssetsValuationAllowance (107,334)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred taxes $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet