XML 30 R23.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 30, 2015
Dec. 29, 2014
Note
Oct. 14, 2014
May 20, 2014
Sep. 16, 2014
Apr. 14, 2014
Debt Instrument [Line Items]            
Warrants outstanding (in shares) 550,000us-gaap_ClassOfWarrantOrRightOutstanding          
Debt issuance costs $ 500,000us-gaap_DebtIssuanceCosts          
Number of senior secured promissory notes issued   3cosi_NumberOfSeniorSecuredPromissoryNotesIssued        
AB Notes [Member]            
Debt Instrument [Line Items]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Black-Scholes model using the following assumptions [Abstract]            
Expected life (in years) 3 years          
Volatility (in hundredths) 63.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
Risk Free interest rate (in hundredths) 0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
Dividend yield (on common stock) (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
         
MILFAMII Note Agreement [Member]            
Black-Scholes model using the following assumptions [Abstract]            
Expected life (in years) 3 years          
Volatility (in hundredths) 63.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Risk Free interest rate (in hundredths) 0.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Dividend yield (on common stock) (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
         
Senior Secured Promissory Note [Member] | AB Notes [Member]            
Debt Instrument [Line Items]            
Face amount       2,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Interest rate (in hundredths)       9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Number of initial semi-annual interest payments may be paid in kind       2cosi_NumberOfInitialSemiAnnualInterestPaymentsMayBePaidInKind
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Paid-in-kind interest rate (in hundredths)       11.00%cosi_DebtInstrumentPaidInKindInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Maturity term       3 years    
Finance fee (in hundredths)       3.50%cosi_DebtInstrumentFeePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Number of warrants issued (in shares)     550,000cosi_NumberOfWarrantsIssuedDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
     
Shares issuable upon exercise of warrant (in shares)       550,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Number of shares forfeited to pay for the warrants in lieu of cash (in shares)     2,895us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
     
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Ownership rate that may not be exceeded (in hundredths)       19.90%cosi_BusinessCombinationMaximumOwnershipInterest
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
   
Fair value of warrants     700,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_AbNotesMember
     
Senior Secured Promissory Note [Member] | MILFAMII Note Agreement [Member]            
Debt Instrument [Line Items]            
Face amount           5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Interest rate (in hundredths)           9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Number of initial semi-annual interest payments may be paid in kind           2cosi_NumberOfInitialSemiAnnualInterestPaymentsMayBePaidInKind
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Paid-in-kind interest rate (in hundredths)           11.00%cosi_DebtInstrumentPaidInKindInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Maturity term           3 years
Finance fee (in hundredths)           3.50%cosi_DebtInstrumentFeePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Number of warrants issued (in shares)         1,100,000cosi_NumberOfWarrantsIssuedDuringPeriod
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Exercise of warrants to purchase common stock (in shares)         1,100,000cosi_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Shares issuable upon exercise of warrant (in shares)           1,100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
$ 0.01us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Aggregate purchase price of warrants         11,000cosi_AggregatePurchasePriceRelatedToExerciseOfWarrants
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Ownership rate that may not be exceeded (in hundredths)           19.90%cosi_BusinessCombinationMaximumOwnershipInterest
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Maximum amount of obligation           4,000,000cosi_ClassOfWarrantOrRightMaximumValue
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
Fair value of warrants         1,300,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
 
Issuance of stock warrants $ 500,000cosi_DebtConversionConvertedInstrumentWarrantsOrOptionsIssuedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember
      $ 1,000,000cosi_DebtConversionConvertedInstrumentWarrantsOrOptionsIssuedAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_LongtermDebtTypeAxis
= cosi_MILFAMIINoteAgreementMember