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
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Less accumulated depreciation and amortization $ 13,703,153   $ 15,476,430
Property and equipment, net 31,411,972   27,952,327
Depreciation and amortization 522,639 $ 420,123  
Written off accumulated depreciation 2,300,000    
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 7,876,257   8,053,787
Written off property plant and equipment 670,000    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 26,829,206   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 21,002,310   18,752,829
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 9,174,291   7,967,181
Restaurant supplies      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,235,371   $ 1,232,317