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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Less accumulated depreciation and amortization $ 14,241,478   $ 14,241,478   $ 15,476,430
Property and equipment, net 33,179,801   33,179,801   27,952,327
Depreciation and amortization 547,438 $ 569,637 1,070,077 $ 989,760  
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 8,310,351   8,310,351   8,053,787
Written off property plant and equipment     670,000    
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 36,270,774   36,270,774   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 30,339,647   30,339,647   18,752,829
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 1,507,633   1,507,633   7,967,181
Restaurant supplies          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 1,332,521   $ 1,332,521   $ 1,232,317