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Fair Value Measurements (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in fair value of the financial liabilities
Increase (Decrease) in fair value included in change in fair value of common stock warrants	$ 46,082,969	$ (2,316,420)	$ (8,827,658)
Change in Classification of Warrants from Liability to Equity Due to Exercise	(35,370,529)
Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Balance at beginning of year	2,859,899	5,176,319	370,926
Increase (Decrease) in fair value included in change in fair value of common stock warrants	46,082,969	(2,316,420)	(8,827,658)
Change in Classification of Warrants from Liability to Equity Due to Exercise	(35,370,529)	0	0
Balance at end of year	19,540,583	2,859,899	5,176,319
Warrant Issued in January 2011 [Member] | Warrants Issued [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Record fair value of warrants issued	0	0	11,727,372
Warrant Issued in December 2011 [Member] | Warrants Issued [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Record fair value of warrants issued	0	0	1,905,679
Warrant Issued in March 2013 [Member] | Warrants Issued [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Record fair value of warrants issued	$ 5,968,244	$ 0	$ 0

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Change in Classification of Warrants from Liability to Equity Due to Exercise

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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

-SubTopic 10

-Section 50

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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

-Publisher FASB

-Name Accounting Standards Codification

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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.

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