Fair Value Measurements (Details 3) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in fair value of the financial liabilities
(Decrease) Increase in fair value included in change in fair value of common stock warrants	$ (516,000)	$ 46,100,000	$ (2,300,000)
Change in Classification of Warrants from Liability to Equity Due to Exercise	(17,002,211)	(35,370,529)
Using Significant Unobservable Inputs (Level 3)
Changes in fair value of the financial liabilities
Balance at beginning of year	19,540,583	2,859,899
(Decrease) Increase in fair value included in change in fair value of common stock warrants	(515,643)	46,082,969
Change in Classification of Warrants from Liability to Equity Due to Exercise	(17,002,211)	(35,370,529)
Balance at end of year	2,022,729	19,540,583
Warrant Issued in March 2013 \| Warrants Issued \| Using Significant Unobservable Inputs (Level 3)
Changes in fair value of the financial liabilities
Record fair value of warrants issued	$ 0	$ 5,968,244

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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