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Loss Per Share - Summary of Loss Per Share Calculation (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Loss Per Share [Line Items]
Net loss attributable to Potbelly Corporation	$ (14,472)	$ (13,336)
Weighted average common shares outstanding-basic	25,944	23,646
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)
Common Share Options [Member]
Loss Per Share [Line Items]
Potentially dilutive shares that are considered anti-dilutive	2,544	2,294

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