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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 1 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 29, 2014
Issuance costs related to sale of stock $ 221,000us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts  
Issuance of stock warrants   1,571,000us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued [1]
Exercise of warrants to purchase common stock   11,000cosi_StockIssuedDuringPeriodValueStockWarrantsExercised [2]
MILFAM II LP [Member]    
Issuance of stock warrants   1,027,000us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= cosi_MILFAMIILPMember
AB Opportunity Fund LLC & AB Value Partners L.P. [Member]    
Issuance of stock warrants   $ 544,000us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= cosi_ABOpportunityFundLLCABValuePartnersLPMember
[1] Represents the relative value of proceeds from issuance of Senior Secured Promissory Notes and related stock warrants for MILFAM II L.P. and AB Opportunity Fund LLC & AB Value Partners L.P, of $1,027,000 and $544,000 respectively, as of the issuance date.
[2] Represents proceeds relating to exercising of warrants to purchase 1.1 million and .5 million shares of unregistered common stock on September 16, 2014 and October 14, 2014, respectively.