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Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details) (USD $)
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6 Months Ended |
12 Months Ended |
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Jun. 30, 2014
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Dec. 31, 2013
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June 5, 2009 Financing [Member]
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|
|
| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
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$ 0.51 |
| Estimated future volatility |
|
109.00% |
| Estimated future risk-free rate |
|
0.13% |
| Equivalent volatility, minimum |
|
43.00% |
| Equivalent volatility, maximum |
|
45.00% |
| Equivalent risk-free rate, minimum |
|
0.05% |
| Equivalent risk-free rate, maximum |
|
0.06% |
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October 23, 2009 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
$ 0.87 |
$ 0.51 |
| Estimated future volatility |
109.00% |
109.00% |
| Estimated future risk-free rate |
0.06% |
0.13% |
| Equivalent volatility |
43.00% |
57.00% |
| Equivalent risk-free rate |
0.03% |
0.07% |
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June 30, 2010 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
|
$ 0.51 |
| Estimated future volatility |
|
109.00% |
| Estimated future risk-free rate |
|
0.13% |
| Equivalent volatility |
|
49.00% |
| Equivalent risk-free rate |
|
0.06% |
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March 31, 2011 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
$ 0.87 |
$ 0.51 |
| Estimated future volatility |
109.00% |
109.00% |
| Estimated future risk-free rate |
1.05% |
1.58% |
| Equivalent volatility |
89.00% |
71.00% |
| Equivalent risk-free rate |
0.20% |
0.27% |
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December 4, 2012 Financing [Member]
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|
|
| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
$ 0.87 |
$ 0.51 |
| Estimated future volatility |
109.00% |
109.00% |
| Estimated future risk-free rate, minimum |
0.85% |
1.58% |
| Estimated future risk-free rate, maximum |
1.98% |
2.72% |
| Equivalent volatility, minimum |
89.00% |
69.00% |
| Equivalent volatility, maximum |
90.00% |
73.00% |
| Equivalent risk-free rate, minimum |
0.16% |
0.22% |
| Equivalent risk-free rate, maximum |
0.38% |
0.40% |
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July 26, 2013 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
$ 0.87 |
$ 0.51 |
| Equivalent volatility, minimum |
88.00% |
69.00% |
| Equivalent volatility, maximum |
89.00% |
77.00% |
| Equivalent risk-free rate, minimum |
0.16% |
0.22% |
| Equivalent risk-free rate, maximum |
0.49% |
0.62% |
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October 16, 2013 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Trading market prices |
$ 0.87 |
$ 0.51 |
| Equivalent volatility, minimum |
89.00% |
69.00% |
| Equivalent volatility, maximum |
|
76.00% |
| Equivalent risk-free rate, minimum |
0.16% |
0.20% |
| Equivalent risk-free rate, maximum |
0.53% |
0.52% |
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January 21, 2014 Financing [Member]
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|
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| Class of Warrant or Right [Line Items] |
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| Trading market prices |
$ 0.87 |
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| Equivalent volatility |
87.00% |
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| Equivalent risk-free rate |
0.57% |
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