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Marketable Securities and Fair Value Measurements (Details 3) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Changes in fair value of the financial liabilities |  |  |  |
Increase in fair value included in change in fair value of common stock warrants | $ 34,900,000 | $ 1,100,000 | $ 39,600,000 | $ 987,000
Using Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Changes in fair value of the financial liabilities |  |  |  |
Balance at January 1, 2013 |  |  | 2,859,899 |
Record fair value of warrants issued |  |  | 5,968,244 |
Increase in fair value included in change in fair value of common stock warrants |  |  | 39,557,404 |
Change in classification from liability to stockholders' equity due to warrant exercises |  |  | (34,289,729) |
Balance at September 30, 2013 | $ 14,095,818 |  | $ 14,095,818 |

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified in shareholders' equity 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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