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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Less accumulated depreciation and amortization $ 14,999,194   $ 14,999,194   $ 15,476,430
Property and equipment, net 35,716,490   35,716,490   27,952,327
Depreciation and amortization 758,282 $ 630,249 1,828,359 $ 1,620,009  
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,279,750   9,279,750   8,053,787
Written off property plant and equipment     670,000    
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 36,790,647   36,790,647   26,175,472
Written off property plant and equipment     1,600,000    
Furniture, fixtures, and equipment and leasehold improvements, less accumulated depreciation and amortization          
Property, Plant and Equipment [Line Items]          
Property and equipment, net 31,071,203   31,071,203   18,752,829
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,292,978   3,292,978   7,967,181
Restaurant supplies          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 1,352,309   $ 1,352,309   $ 1,232,317