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Summary of Significant Accounting Policies - Commissions Related to Franchise Sales (Details) - Commissions Related to Franchise Sales
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Capitalized Contract Cost [Line Items]  
Balance at beginning of period $ 3,578
Expense recognized 1,076
Additions to contract cost for new activity 1,142
Balance at end of period $ 3,644