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Earnings per Share (Tables) | 12 Months Ended
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Dec. 28, 2014
Earnings Per Share [Abstract] |
Schedule of the Calculation of Weighted Average Common Shares Outstanding for Basic and Diluted Earnings per Share Available to Common Stockholders |
|  | Fiscal Year |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Calculation of undistributed income (loss) for basic and diluted shares: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Potbelly Corporation |  | $ | 4,358 |  |  | $ | 1,258 |  |  | $ | 24,046 |
Less: Dividend paid to common and preferred stockholders |  |  | — |  |  |  | (49,854 | ) |  |  | — |
Less: Accretion of redeemable convertible preferred stock to maximum redemption value |  |  | — |  |  |  | (15,097 | ) |  |  | (10,495 | )
Undistributed income (loss) for basic and diluted shares |  | $ | 4,358 |  |  | $ | (63,693 | ) |  | $ | 13,551 |
Allocation of undistributed income (losses) to participating securities: |  |  |  |  |  |  |  |  |  |  |  |
Common shares |  | $ | 4,358 |  |  | $ | (63,693 | ) |  | $ | 2,878 |
Redeemable convertible preferred shares |  |  | — |  |  |  | — |  |  |  | 10,673 |
Undistributed income (loss) |  | $ | 4,358 |  |  | $ | (63,693 | ) |  | $ | 13,551 |
Weighted average common shares outstanding-basic |  |  | 29,209,298 |  |  |  | 10,132,805 |  |  |  | 4,013,414 |
Plus: Effect of potential stock options exercise |  |  | 949,142 |  |  |  | — |  |  |  | 18,052 |
Plus: Effect of potential warrant exercise |  |  | 116,621 |  |  |  | — |  |  |  | 357,356 |
Weighted average common shares outstanding-diluted |  |  | 30,275,061 |  |  |  | 10,132,805 |  |  |  | 4,388,822 |
Income (loss) per share available to common stockholders-basic |  | $ | 0.15 |  |  | $ | (6.29 | ) |  | $ | 0.72 |
Income (loss) per share available to common stockholders-diluted |  | $ | 0.14 |  |  | $ | (6.29 | ) |  | $ | 0.66 |
Potentially dilutive shares that are considered anti-dilutive: |  |  |  |  |  |  |  |  |  |  |  |
Common share options |  |  | 622,879 |  |  |  | 5,029,576 |  |  |  | 1,258,537 |
Warrants |  |  | — |  |  |  | 247,704 |  |  |  | — |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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