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Stockholders' Equity (Details 1) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Summary of warrants outstanding |  |
Number of Warrants | 35,227,529 | 21,593,844
Common Stock Warrant Liability | $ 10,254,959 | $ 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 | 6,625,297 | 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 | 2,425,409 | 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 | 1,202,320 | 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 | 1,933 | 1,267
Warrants assumed in June 2009 Merger [Member] |  |
Summary of warrants outstanding |  |
Number of Warrants | 4,865,579 | 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 | Apr. 09, 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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- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 98-5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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