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Summary of Significant Accounting Policies - Investments in Unconsolidated Affiliates (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
restaurant
Jan. 02, 2018
USD ($)
restaurant
Oct. 01, 2019
Investments in unconsolidated affiliates        
Equity investments in number of restaurants | restaurant   2 2  
Impairment of assets | $ $ 0 $ 0 $ 0  
North Italia and Flower Child        
Investments in unconsolidated affiliates        
Ownership percentage       49.00%