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Earnings per share (Tables)

9 Months Ended

Sep. 29, 2013

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


		13 Weeks Ended								39 Weeks Ended
		September 29, 2013				September 23, 2012				September 29, 2013				September 23, 2012
Calculation of undistributed (loss) for basic and diluted shares:
Net income attributable to Potbelly Corporation		$	2,165			$	2,548			$	4,941			$	5,571
Less: Dividend declared to common and preferred stockholders			(49,854	)			—				(49,854	)			—
Less: Accretion of redeemable convertible preferred stock to maximum redemption value			(4,796	)			(5,545	)			(15,097	)			(13,887	)

Undistributed loss for basic and diluted shares		$	(52,485	)		$	(2,997	)		$	(60,010	)		$	(8,316	)

Allocation of undistributed(loss) to participating securities:
Common shares		$	(52,485	)		$	(2,997	)		$	(60,010	)		$	(8,316	)
Redeemable convertible preferred shares			—				—				—				—

Undistributed (loss) income		$	(52,485	)		$	(2,997	)		$	(60,010	)		$	(8,316	)

Weighted average common shares outstanding-basic			4,268,953				3,972,873				4,250,819				3,972,873
Plus: Effect of potential stock options exercise			—				—				—				—
Plus: Effect of potential warrant exercise			—				—				—				—

Weighted average common shares outstanding-diluted			4,268,953				3,972,873				4,250,819				3,972,873

Income (loss) per share available to common stockholders-basic		$	(12.29	)		$	(0.75	)		$	(14.12	)		$	(2.09	)
Income (loss) per share available to common stockholders-diluted		$	(12.29	)		$	(0.75	)		$	(14.12	)		$	(2.09	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options			4,744,664				4,446,049				4,744,664				4,446,049
Warrants			241,704				378,996				241,704				378,996