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Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||
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Dec. 18, 2007
December 18, 2007 Financing [Member]
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Mar. 20, 2008
March 20, 2008 Financing [Member]
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Jun. 05, 2009
June 5, 2009 Financing [Member]
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Dec. 31, 2012
June 5, 2009 Financing [Member]
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Dec. 31, 2011
June 5, 2009 Financing [Member]
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Oct. 23, 2009
October 23, 2009 Financing [Member]
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Dec. 31, 2012
October 23, 2009 Financing [Member]
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Dec. 31, 2011
October 23, 2009 Financing [Member]
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Jun. 30, 2010
June 30, 2010 Financing [Member]
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Dec. 31, 2012
June 30, 2010 Financing [Member]
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Dec. 31, 2011
June 30, 2010 Financing [Member]
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Mar. 31, 2011
March 31, 2011 Financing [Member]
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Dec. 31, 2012
March 31, 2011 Financing [Member]
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Dec. 31, 2011
March 31, 2011 Financing [Member]
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Dec. 04, 2012
December 4, 2012 Financing [Member]
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Dec. 31, 2012
December 4, 2012 Financing [Member]
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| Trading market prices | $ 1.75 | $ 2.14 | $ 1.14 | $ 0.31 | $ 0.38 | $ 0.69 | $ 0.31 | $ 0.38 | $ 1.43 | $ 0.31 | $ 0.38 | $ 1.18 | $ 0.31 | $ 0.38 | $ 0.31 | |
| Trading market prices, minimum | $ 0.30 | |||||||||||||||
| Trading market prices, maximum | $ 0.33 | |||||||||||||||
| Estimated future volatility, minimum | 98.00% | 98.00% | 86.00% | 100.00% | 93.00% | 87.00% | 85.00% | |||||||||
| Estimated future volatility | 100.00% | |||||||||||||||
| Estimated future volatility, maximum | 143.00% | 142.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | ||
| Estimated future risk-free rate, minimum | 0.63% | 2.63% | 0.38% | 0.16% | 0.38% | 1.32% | 0.16% | 0.38% | 0.52% | 0.58% | ||||||
| Estimated future risk-free rate | 3.27% | 1.95% | 0.16% | 0.38% | 1.78% | |||||||||||
| Estimated future risk-free rate, maximum | 4.31% | 3.80% | 0.34% | 0.58% | 0.34% | 0.58% | 3.64% | 0.58% | 1.54% | 1.065% | 1.26% | |||||
| Equivalent volatility, minimum | 103.00% | 92.00% | 80.00% | 98.00% | 74.00% | 72.00% | 72.00% | 79.00% | 72.00% | 88.00% | ||||||
| Equivalent volatility | 106.00% | 97.00% | 98.00% | 74.00% | 74.00% | 88.00% | ||||||||||
| Equivalent volatility, maximum | 117.00% | 81.00% | 99.00% | 93.00% | 81.00% | 75.00% | 79.00% | 96.00% | 89.00% | 90.00% | 90.00% | |||||
| Equivalent risk-free rate, minimum | 0.20% | 0.93% | 0.06% | 0.08% | 0.06% | 0.08% | 0.39% | 0.06% | 0.08% | 0.22% | 0.21% | |||||
| Equivalent risk-free rate | 3.26% | 1.31% | 0.11% | 0.14% | 0.59% | 0.06% | ||||||||||
| Equivalent risk-free rate, maximum | 1.44% | 1.16% | 0.13% | 0.16% | 0.14% | 1.09% | 0.23% | 0.28% | 0.31% | 0.32% | ||||||
| Estimated additional shares to be issued upon dilutive event | 98,838 | 7,479 | ||||||||||||||