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Stockholders' Equity (Details 1) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Summary of warrants outstanding |  |
Number of Warrants | 6,455,169 | 14,059,260
Common Stock Warrant Liability | $ 6,045,903 | $ 19,540,583
March 2013 Financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 0.79 | 0.79
Expiration Date | Sep. 12, 2018 |
Number of Warrants | 2,113,634 | 3,022,725
Common Stock Warrant Liability | 5,875,903 | 7,859,085
January 2011 financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 1.40 | 1.40
Expiration Date | Jan. 27, 2016 |
Number of Warrants | 0 | 6,695,000
Common Stock Warrant Liability | 0 | 11,381,498
July 2009 financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 3.38 | 3.38
Expiration Date | Jul. 01, 2014 |
Number of Warrants | 333,333 | 333,333
Common Stock Warrant Liability | 170,000 | 300,000
Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Number of Warrants | 4,008,202 | 4,008,202
Common Stock Warrant Liability | $ 0 | $ 0
Minimum [Member] | Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 1.02 | 1.02
Expiration Date | Aug. 01, 2015 |
Maximum [Member] | Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 1.28 | 1.28
Expiration Date | Apr. 28, 2016 |

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