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Marketable Securities and Fair Value Measurements (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in fair value of the financial liabilities
Change in classification from liability to stockholders' equity due to warrant exercise	$ 1,200,000	$ 1,400,000
Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Balance at January 1, 2014	19,540,583
Increase in fair value included in change in fair value of common stock warrants	1,198,426
Change in classification from liability to stockholders' equity due to warrant exercise	(14,693,106)
Balance at March 31, 2014	$ 6,045,903

X

- 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

-Subparagraph (c)(1)

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X

- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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