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Franchise fees receivable - Roll-Forward of Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Adjustments related to adoption of ASC 606     $ (1,358)
Initial Franchise Fees      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance $ 455 $ 335  
Charges to bad debts 121 409  
Write offs (84) (289)  
Ending balance $ 52 $ 455  
Initial Franchise Fees | Accounting Standards Update 2014-09      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Adjustments related to adoption of ASC 606     $ (440)