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Franchise fees receivable - Roll-Forward of Allowance (Details) - Initial Franchise Fees - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning balance $ 52 $ 455
Charges to bad debts 387 121
Write offs (290) (84)
Ending balance $ 149 52
Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning balance   (440)
Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning balance   $ 15