Annual report pursuant to Section 13 and 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Summary of Contract Balances (Details)

v3.21.1
Nature of Operations and Summary of Significant Accounting Policies - Summary of Contract Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Franchising Receivables [Member]    
Disaggregation Of Revenue [Line Items]    
Recognized revenue $ 480 $ 369
Advertising Co Op Funds [Member]    
Disaggregation Of Revenue [Line Items]    
Recognized revenue   159
Gift Card Liability [Member]    
Disaggregation Of Revenue [Line Items]    
Recognized revenue 430 586
Deferred Revenue, Current [Member]    
Disaggregation Of Revenue [Line Items]    
Recognized revenue 490 438
Deferred Revenue, Long-term [Member]    
Disaggregation Of Revenue [Line Items]    
Recognized revenue $ 2,816 $ 4,250