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