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Loss Per Share | 3 Months Ended
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Mar. 28, 2021
Earnings Per Share [Abstract] |
Loss Per Share | (4) Loss Per Share Basic and diluted income per common share attributable to common stockholders are calculated using the weighted average number of common shares outstanding for the period. Diluted income per common share attributable to common stockholders is computed by dividing the income allocated to common stockholders by the weighted average number of fully diluted common shares outstanding. In periods of a net loss, no potential common shares are included in diluted shares outstanding as the effect is anti-dilutive. For the 13 weeks ended March 28, 2021, we had a loss per share, and therefore potentially dilutive shares were excluded from the calculation. The following table summarizes the loss per share calculation:
|  | For the 13 Weeks Ended |
|  | March 28, |  |  | March 29, |
|  | 2021 |  |  | 2020 |
Net loss attributable to Potbelly Corporation |  | $ | (14,472 | ) |  | $ | (13,336 | )
Weighted average common shares outstanding-basic |  |  | 25,944 |  |  |  | 23,646 |
Plus: Effect of potential stock options exercise |  |  | — |  |  |  | — |
Weighted average common shares outstanding-diluted |  |  | 25,944 |  |  |  | 23,646 |
Loss per share available to common stockholders-basic |  | $ | (0.56 | ) |  | $ | (0.56 | )
Loss per share available to common stockholders-diluted |  | $ | (0.56 | ) |  | $ | (0.56 | )
Potentially dilutive shares that are considered anti-dilutive: |  |  |  |  |  |  |  |
Common share options |  |  | 2,544 |  |  |  | 2,294 |

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