Member loans (Details)
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9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||
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Sep. 30, 2013
USD ($)
|
Sep. 30, 2012
USD ($)
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Dec. 31, 2012
USD ($)
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Dec. 31, 2011
USD ($)
|
Dec. 31, 2010
USD ($)
|
Feb. 28, 2009
Demand Loans [Member]
USD ($)
|
Dec. 31, 2012
Demand Loans [Member]
USD ($)
|
Dec. 31, 2011
Demand Loans [Member]
USD ($)
|
Dec. 31, 2010
Demand Loans [Member]
USD ($)
|
Sep. 30, 2013
Demand Loans [Member]
USD ($)
|
Dec. 31, 2007
Demand Loans [Member]
USD ($)
|
Dec. 31, 2007
Demand Loans [Member]
Minimum [Member]
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Dec. 31, 2007
Demand Loans [Member]
Maximum [Member]
|
Oct. 31, 2009
Notes Payable Related Party [Member]
USD ($)
|
Dec. 31, 2012
Notes Payable Related Party [Member]
USD ($)
|
Dec. 31, 2011
Notes Payable Related Party [Member]
USD ($)
|
Dec. 31, 2010
Notes Payable Related Party [Member]
USD ($)
|
Oct. 13, 2009
Notes Payable Related Party [Member]
USD ($)
|
Dec. 09, 2011
Loan Agreement One [Member]
GBP (£)
|
Dec. 09, 2011
Loan Agreement Two [Member]
GBP (£)
|
Dec. 31, 2012
Loan Agreements [Member]
USD ($)
|
Dec. 31, 2011
Loan Agreements [Member]
USD ($)
|
Dec. 31, 2009
Loan Agreements [Member]
USD ($)
|
Sep. 30, 2013
Loan Agreements [Member]
USD ($)
|
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Debt Instrument [Line Items] | ||||||||||||||||||||||||
Loans payable | $ 7,377,318 | $ 5,027,613 | $ 4,181,391 | $ 3,760,211 | $ 6,473,702 | $ 782,253 | $ 846,222 | $ 903,616 | ||||||||||||||||
Interest rate | 6.00% | 12.00% | 12.00% | 8.00% | 8.00% | |||||||||||||||||||
Conversion of debt to equity | 644,771 | 1,000,000 | ||||||||||||||||||||||
Note payable forgiven | 500,000 | |||||||||||||||||||||||
Accrued interest on member loans | 277,633 | 1,106,614 | 885,434 | 1,398,925 | 5,601 | |||||||||||||||||||
Interest expense | 349,705 | 141,417 | 281,180 | 362,431 | 362,168 | 281,299 | 252,405 | 266,165 | 8,408 | 110,026 | 101,003 | 45,379 | ||||||||||||
Face value of debt | 4,392,777 | 750,000 | 230,000 | 300,000 | ||||||||||||||||||||
Maturity | Oct. 13, 2014 | |||||||||||||||||||||||
Additional funding | $ 26,652 |