XML 91 R69.htm IDEA: XBRL DOCUMENT v3.20.4
Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 27, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 29, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Amount of revenue recognized $ 74,866 $ 72,663 $ 56,162 $ 87,590 $ 101,752 $ 104,238 $ 105,630 $ 98,087 $ 291,281 $ 409,707 $ 422,638
Income (Loss) from operations (16,122) (16,138) (21,887) (16,985) (862) (2,143) (1,468) (4,723) (71,132) (9,196) (10,602)
Net loss attributable to Potbelly Corporation $ (16,427) $ (13,412) $ (22,216) $ (13,336) $ (1,332) $ (2,355) $ (1,866) $ (18,439) $ (65,391) $ (23,992) $ (8,878)
Loss per share available to common stockholders-basic $ (0.68) $ (0.56) $ (0.93) $ (0.56) $ (0.06) $ (0.10) $ (0.08) $ (0.76) $ (2.74) $ (1.01) $ (0.35)
Loss per share available to common stockholders-diluted $ (0.68) $ (0.56) $ (0.93) $ (0.56) $ (0.06) $ (0.10) $ (0.08) $ (0.76) $ (2.74) $ (1.01) $ (0.35)