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Earnings per Share | 12 Months Ended
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Dec. 28, 2014
Earnings Per Share [Abstract] |
Earnings per Share | (4) Earnings per share Basic and diluted income (loss) per common share attributable to common stockholders are calculated using the weighted average number of common shares outstanding for the period. Diluted income (loss) per common share attributable to common stockholders is computed by dividing the income (loss) allocated to common stockholders utilizing the two-class method by the weighted average number of fully diluted common shares outstanding. The Company’s redeemable convertible preferred stock were all considered participating securities requiring the two-class method to calculate basic and diluted earnings per share. In periods of a net loss attributable to common stockholders, the redeemable convertible preferred stock were excluded from the computation of basic earnings per share due to the fact that they are not required to fund losses and the redemption amount is not reduced as a result of losses. For the fiscal year 2012, the dilutive securities did not include stock options awarded to employees that had a performance condition requiring the completion of an initial public offering of common stock, as that performance condition was not satisfied at the reporting date and the holders of these options did not have rights to our undistributed earnings until that time.
|  | 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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