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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 |

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