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Earnings per Share (Tables)

12 Months Ended

Dec. 28, 2014

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


		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				—