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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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- 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) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- 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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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