Income Taxes	3 Months Ended
Mar. 30, 2015
Income Taxes [Abstract]
Income Taxes	Note 7 – Income Taxes We have recorded a full valuation allowance to reduce our deferred tax assets that relate primarily to net operating loss carryforwards. Our determination of the valuation allowance is based on an evaluation of whether it is more likely than not that we will be able to utilize the net operating loss carryforwards based on the Company's operating results. As of December 29, 2014, we had net operating loss ("NOL") carryforwards of approximately $243 million for U.S. federal income tax purposes. Under the Internal Revenue Code, an "ownership change" with respect to a corporation can significantly limit the amount of pre-ownership change NOLs and certain other tax assets that the corporation may utilize after the ownership change to offset future taxable income, possibly reducing the amount of cash available to the corporation to satisfy its obligations. An ownership change generally would occur if the aggregate stock ownership of holders of at least 5% of our stock increases by more than 50 percentage points over the preceding three year period. We are currently analyzing and do not believe the purchase of shares of our common stock pursuant to the rights offerings completed December 23, 2014, and July 9, 2013, conversions of $0.01 warrants in 2014 in connection with the senior secured promissory notes issued May 20, 2014, and April 14, 2014 and private placements completed August 22, 2014, have triggered an ownership change. In addition, a limitation would not have an impact on our consolidated financial statements as we have recorded a valuation allowance for the entire amount of our deferred tax assets. We adopted ASC 740-10, Income Taxes, which prescribes a comprehensive financial statement model of how a company should recognize, measure, present and disclose uncertain tax positions that the company has taken or expects to take in its income tax returns. The standard requires that only income tax benefits that meet the "more likely than not" recognition threshold be recognized or continue to be recognized on the effective date. Initial recognition amounts would have been reported as a cumulative effect of a change in accounting principle. Should the Company need to accrue interest or penalties on uncertain tax positions, it would recognize the interest as interest expense and the penalties as a general and administrative expense. Due to our unexpired NOLs, Cosi could be subject to IRS income tax examination for the tax year 1996 and all subsequent years. We could also be subject to state income tax examinations in certain states where we have unexpired NOLs.

Note 7 – Income Taxes

We have recorded a full valuation allowance to reduce our deferred tax assets that relate primarily to net operating loss carryforwards. Our determination of the valuation allowance is based on an evaluation of whether it is more likely than not that we will be able to utilize the net operating loss carryforwards based on the Company's operating results.

As of December 29, 2014, we had net operating loss ("NOL") carryforwards of approximately $243 million for U.S. federal income tax purposes. Under the Internal Revenue Code, an "ownership change" with respect to a corporation can significantly limit the amount of pre-ownership change NOLs and certain other tax assets that the corporation may utilize after the ownership change to offset future taxable income, possibly reducing the amount of cash available to the corporation to satisfy its obligations. An ownership change generally would occur if the aggregate stock ownership of holders of at least 5% of our stock increases by more than 50 percentage points over the preceding three year period. We are currently analyzing and do not believe the purchase of shares of our common stock pursuant to the rights offerings completed December 23, 2014, and July 9, 2013, conversions of $0.01 warrants in 2014 in connection with the senior secured promissory notes issued May 20, 2014, and April 14, 2014 and private placements completed August 22, 2014, have triggered an ownership change. In addition, a limitation would not have an impact on our consolidated financial statements as we have recorded a valuation allowance for the entire amount of our deferred tax assets.

We adopted ASC 740-10, Income Taxes, which prescribes a comprehensive financial statement model of how a company should recognize, measure, present and disclose uncertain tax positions that the company has taken or expects to take in its income tax returns. The standard requires that only income tax benefits that meet the "more likely than not" recognition threshold be recognized or continue to be recognized on the effective date. Initial recognition amounts would have been reported as a cumulative effect of a change in accounting principle.

Should the Company need to accrue interest or penalties on uncertain tax positions, it would recognize the interest as interest expense and the penalties as a general and administrative expense.

Due to our unexpired NOLs, Cosi could be subject to IRS income tax examination for the tax year 1996 and all subsequent years. We could also be subject to state income tax examinations in certain states where we have unexpired NOLs.