|
Property and equipment, net (Details) (USD $)
|
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Property, Plant and Equipment [Line Items] | ||||
| Property and equipment, gross | $ 31,830,721 | $ 30,404,806 | $ 28,409,495 | |
| Less accumulated depreciation and amortization | 18,471,452 | 16,769,324 | 9,407,503 | |
| Totals | 13,359,269 | 13,635,482 | 19,001,992 | |
| Depreciation and amortization | 1,312,526 | 7,329,860 | 1,709,291 | 2,504,534 |
|
Furniture, fixtures and equipment [Member]
|
||||
| Property, Plant and Equipment [Line Items] | ||||
| Property and equipment, gross | 6,414,575 | 6,033,422 | 5,526,948 | |
|
Leasehold improvements [Member]
|
||||
| Property, Plant and Equipment [Line Items] | ||||
| Property and equipment, gross | 24,248,454 | 23,767,148 | 22,421,249 | |
|
Construction in progress [Member]
|
||||
| Property, Plant and Equipment [Line Items] | ||||
| Property and equipment, gross | 588,000 | 11,653 | 53,553 | |
|
Restaurant supplies [Member]
|
||||
| Property, Plant and Equipment [Line Items] | ||||
| Property and equipment, gross | $ 579,692 | $ 592,583 | $ 407,745 | |