Quarterly report pursuant to Section 13 or 15(d)

Property and equipment, net (Details)

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Property and equipment, net (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Less accumulated depreciation and amortization $ 18,309,204   $ 18,309,204   $ 15,809,101
Property and equipment, net 38,304,639   38,304,639   36,815,239
Depreciation and amortization 950,513 $ 758,282 2,621,063 $ 1,828,359  
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 10,052,933   10,052,933   9,130,469
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 40,757,381   40,757,381   36,147,135
Furniture, fixtures, and equipment and leasehold improvements, less accumulated depreciation and amortization          
Property, Plant and Equipment [Line Items]          
Property and equipment, net 32,501,110   32,501,110   29,468,503
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,327,768   4,327,768   5,992,614
Restaurant supplies          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 1,475,761   $ 1,475,761   $ 1,354,122