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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 27, 2020
Earnings Per Share [Abstract] |
Summary of Earnings (Loss) Per Share Calculation | The following table summarizes the earnings (loss) per share calculation (in thousands):
|  | Fiscal Year |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net loss attributable to Potbelly Corporation |  | $ | (65,391 | ) |  | $ | (23,992 | ) |  | $ | (8,878 | )
Weighted average common shares outstanding-basic |  |  | 23,899 |  |  |  | 23,850 |  |  |  | 25,173 |
Plus: Effect of potential stock options exercise |  |  | — |  |  |  | — |  |  |  | — |
Weighted average common shares outstanding-diluted |  |  | 23,899 |  |  |  | 23,850 |  |  |  | 25,173 |
Loss per share available to common stockholders- basic |  | $ | (2.74 | ) |  | $ | (1.01 | ) |  | $ | (0.35 | )
Loss per share available to common stockholders- diluted |  | $ | (2.74 | ) |  | $ | (1.01 | ) |  | $ | (0.35 | )
Potentially dilutive shares that are considered anti-dilutive: |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  | 2,754 |  |  |  | 2,334 |  |  |  | 2,499 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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