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Marketable Securities and Fair Value Measurements (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in fair value of the financial liabilities
Decrease in fair value included in change in fair value of common stock warrants	$ (176,000)	$ 34,900,000	$ (331,000)	$ 39,600,000
Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Balance at January 1, 2014			19,540,583
Decrease in fair value included in change in fair value of common stock warrants			(330,984)
Change in classification from liability to stockholders' equity due to warrant exercise			(17,002,211)
Balance at September 30, 2014	$ 2,207,388		$ 2,207,388

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Change in Classification from Liability to Stockholders' Equity

+ References

No definition available.

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- Definition

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

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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