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Amortization expense for acquired identifiable intangible assets (Details) (USD $)
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Dec. 31, 2013
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| Amortization expense for acquired identifiable intangible assets | |
| Amortization expense for acquired identifiable intangible assets for 2011 in millions | 2.3 |
| Amortization expense for acquired identifiable intangible assets for 2012 in millions | 2.3 |
| Amortization expense for acquired identifiable intangible assets for 2013 in millions | 2.3 |
| Amortization expense for acquired identifiable intangible assets for 2014 | $ 2,263,776 |
| Amortization expense for acquired identifiable intangible assets for 2015 | 637,819 |
| Total Amortization expense for acquired identifiable intangible assets for 2014 and 2015 | $ 2,901,595 |