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Preferred Stock Convertible Redeemable Series E Preferred Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Net proceeds from issuance of capital stock	$ 16,710,645us-gaap_ProceedsFromIssuanceOrSaleOfEquity	$ 58,736,165us-gaap_ProceedsFromIssuanceOrSaleOfEquity	$ 16,428,827us-gaap_ProceedsFromIssuanceOrSaleOfEquity

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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