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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Less accumulated depreciation and amortization $ 17,386,116   $ 17,386,116   $ 15,809,101
Property and equipment, net 39,067,118   39,067,118   36,815,239
Depreciation and amortization 804,680 $ 547,438 1,670,550 $ 1,070,077  
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 10,038,402   10,038,402   9,130,469
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 40,758,041   40,758,041   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 33,410,327   33,410,327   29,468,503
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,234,165   4,234,165   5,992,614
Restaurant supplies          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 1,422,626   $ 1,422,626   $ 1,354,122