Post-effective amendment to a registration statement that is not immediately effective upon filing

Basis of Presentation - Summary of Store activity (Details)

v3.21.2
Basis of Presentation - Summary of Store activity (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Store
Sep. 30, 2021
Store
Business
Sep. 30, 2021
Store
Business
Dec. 31, 2020
Store
Dec. 31, 2019
Store
Schedule Of Store Activity [Line Items]          
Stores, end of the period   116 116    
Franchised Stores [Member]          
Schedule Of Store Activity [Line Items]          
Stores, beginning of the period 117 97 102 117 109
Stores opened during the period   0 3 9  
Stores transferred/sold to the Company (2)     (2) 0
Stores closed during the period (22) (4) (12) (22) (7)
Stores, end of the period 102 93 93 102 117
Corporate Owned Stores [Member]          
Schedule Of Store Activity [Line Items]          
Stores, beginning of the period   22 17 13  
Stores opened during the period   2 7 2  
Stores transferred/sold to the Company       2  
Stores closed during the period | Business   (1) (1)    
Stores, end of the period 17 23 23 17 13