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Stockholders' Equity (Details 1) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Summary of warrants outstanding |  |
Number of Warrants | 35,225,566 | 21,593,844
Common Stock Warrant Liability | $ 13,453,937 | $ 2,859,899
March 2013 Financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 0.79 |
Expiration Date | Sep. 12, 2018 |
Number of Warrants | 13,688,633 | 0
Common Stock Warrant Liability | 9,102,940 | 0
December 2011 financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 0.65 |
Expiration Date | Dec. 06, 2016 |
Number of Warrants | 5,774,784 | 5,774,784
Common Stock Warrant Liability | 2,309,913 | 2,078,921
January 2011 financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 1.40 |
Expiration Date | Jan. 27, 2016 |
Number of Warrants | 10,565,200 | 10,565,200
Common Stock Warrant Liability | 2,039,084 | 779,711
July 2009 financing [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 3.38 |
Expiration Date | Jul. 01, 2014 |
Number of Warrants | 333,333 | 333,333
Common Stock Warrant Liability | 2,000 | 1,267
Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Number of Warrants | 4,863,616 | 4,920,527
Common Stock Warrant Liability | $ 0 | $ 0
Minimum [Member] | Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 0.05 |
Expiration Date | Sep. 27, 2013 |
Maximum [Member] | Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Exercise Price | 1.28 |
Expiration Date | Apr. 28, 2016 |

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