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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Less accumulated depreciation and amortization $ 13,193,264   $ 13,193,264   $ 13,833,271
Property and equipment, net 22,838,966   22,838,966   18,815,625
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 7,986,196   7,986,196   7,336,956
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 24,007,140   24,007,140   20,719,230
Less accumulated depreciation and amortization          
Property, Plant and Equipment [Line Items]          
Property and equipment, net 18,800,072   18,800,072   14,222,915
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,119,493   3,119,493   3,871,670
Restaurant supplies          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 919,401   919,401   $ 721,040
Continuing Operations          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization $ 569,637 $ 348,848 $ 989,760 $ 672,654  
Discontinued Operations          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization       $ 85,872