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Related party transactions (Details) (USD $)
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12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2013
Non-Interest Bearing Cash Advances [Member]
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Dec. 31, 2012
Non-Interest Bearing Cash Advances [Member]
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Dec. 31, 2012
Design Services [Member]
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Dec. 31, 2011
Design Services [Member]
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Dec. 31, 2010
Design Services [Member]
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Dec. 31, 2012
Legal Fees [Member]
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Dec. 31, 2011
Legal Fees [Member]
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Dec. 31, 2010
Legal Fees [Member]
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Dec. 31, 2012
Consulting Fees [Member]
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Dec. 31, 2011
Consulting Fees [Member]
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Dec. 31, 2010
Consulting Fees [Member]
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Dec. 31, 2010
Construction Serivces [Member]
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| Related Party Transaction [Line Items] | |||||||||||||||
| Due to related parties | $ 304,423 | $ 518,366 | $ 20,400 | $ 36,900 | $ 410,000 | $ 343,000 | |||||||||
| Incurred expenses | 950 | 273,000 | 421,000 | 654,000 | 451,000 | 517,000 | 53,000 | 25,000 | |||||||
| Other assets | $ 929,620 | $ 925,389 | $ 332,883 | $ 678,495 | $ 657,912 | ||||||||||