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Warrants (Summary Of Shares Indexed To The Warrants) (Details)
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Mar. 31, 2013
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Dec. 31, 2012
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Dec. 04, 2012
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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]
Series I Warrants [Member]
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Jun. 05, 2009
June 5, 2009 Financing [Member]
Series II Warrants [Member]
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Mar. 31, 2013
June 5, 2009 Financing [Member]
Series III Warrants [Member]
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Dec. 31, 2012
June 5, 2009 Financing [Member]
Series III Warrants [Member]
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Jun. 05, 2009
June 5, 2009 Financing [Member]
Series III Warrants [Member]
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Mar. 31, 2013
June 5, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 31, 2012
June 5, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Jun. 05, 2009
June 5, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Mar. 31, 2013
October 23, 2009 Financing [Member]
Warrants To Institutional Investors [Member]
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Dec. 31, 2012
October 23, 2009 Financing [Member]
Warrants To Institutional Investors [Member]
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Oct. 23, 2009
October 23, 2009 Financing [Member]
Warrants To Institutional Investors [Member]
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Mar. 31, 2013
October 23, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 31, 2012
October 23, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Oct. 23, 2009
October 23, 2009 Financing [Member]
Warrants To Placement Agent [Member]
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Mar. 31, 2013
June 30, 2010 Financing [Member]
Warrants To Institutional Investors [Member]
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Dec. 31, 2012
June 30, 2010 Financing [Member]
Warrants To Institutional Investors [Member]
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Jun. 30, 2010
June 30, 2010 Financing [Member]
Warrants To Institutional Investors [Member]
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Mar. 31, 2013
June 30, 2010 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 31, 2012
June 30, 2010 Financing [Member]
Warrants To Placement Agent [Member]
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Jun. 30, 2010
June 30, 2010 Financing [Member]
Warrants To Placement Agent [Member]
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Mar. 31, 2013
March 31, 2011 Financing [Member]
Warrants To Institutional Investors [Member]
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Dec. 31, 2012
March 31, 2011 Financing [Member]
Warrants To Institutional Investors [Member]
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Mar. 31, 2011
March 31, 2011 Financing [Member]
Warrants To Institutional Investors [Member]
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Mar. 31, 2013
March 31, 2011 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 31, 2012
March 31, 2011 Financing [Member]
Warrants To Placement Agent [Member]
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Mar. 31, 2011
March 31, 2011 Financing [Member]
Warrants To Placement Agent [Member]
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Mar. 31, 2013
December 4, 2012 Financing [Member]
Warrants To Institutional Investors [Member]
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Dec. 31, 2012
December 4, 2012 Financing [Member]
Warrants To Institutional Investors [Member]
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Dec. 04, 2012
December 4, 2012 Financing [Member]
Warrants To Institutional Investors [Member]
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Mar. 31, 2013
December 4, 2012 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 31, 2012
December 4, 2012 Financing [Member]
Warrants To Placement Agent [Member]
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Dec. 04, 2012
December 4, 2012 Financing [Member]
Warrants To Placement Agent [Member]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of shares indexed | 21,656,142 | 21,656,142 | 28,087,383 | 1,078,579 | 128,572 | 2,222,222 | 1,866,666 | 1,555,555 | 1,555,555 | 1,555,555 | 132,143 | 132,143 | 142,857 | 1,228,333 | 1,228,333 | 2,125,334 | 18,445 | 18,445 | 245,932 | 2,000,000 | 2,000,000 | 2,000,000 | 200,000 | 200,000 | 200,000 | 3,333,333 | 3,333,333 | 3,333,333 | 208,333 | 208,333 | 208,333 | 12,100,000 | 12,100,000 | 12,100,000 | 880,000 | 880,000 | 880,000 |