Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details) (USD $)	0 Months Ended			3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 18, 2007 December 18, 2007 Financing [Member]	Mar. 20, 2008 March 20, 2008 Financing [Member]	Jun. 05, 2009 June 5, 2009 Financing [Member]	Mar. 31, 2013 June 5, 2009 Financing [Member]	Dec. 31, 2012 June 5, 2009 Financing [Member]	Oct. 23, 2009 October 23, 2009 Financing [Member]	Mar. 31, 2013 October 23, 2009 Financing [Member]	Dec. 31, 2012 October 23, 2009 Financing [Member]	Jun. 30, 2010 June 30, 2010 Financing [Member]	Mar. 31, 2013 June 30, 2010 Financing [Member]	Dec. 31, 2012 June 30, 2010 Financing [Member]	Mar. 31, 2011 March 31, 2011 Financing [Member]	Mar. 31, 2013 March 31, 2011 Financing [Member]	Dec. 31, 2012 March 31, 2011 Financing [Member]	Dec. 04, 2012 December 4, 2012 Financing [Member]	Mar. 31, 2013 December 4, 2012 Financing [Member]	Dec. 31, 2012 December 4, 2012 Financing [Member]
Trading market prices	$ 1.75	$ 2.14	$ 1.14	$ 0.31	$ 0.31	$ 0.69	$ 0.31	$ 0.31	$ 1.43	$ 0.31	$ 0.31	$ 1.18	$ 0.31	$ 0.31		$ 0.31	$ 0.31
Trading market prices, minimum															$ 0.30
Trading market prices, maximum															$ 0.33
Estimated future volatility, minimum					100.00%			100.00%			100.00%	100.00%	87.00%	93.00%		88.00%	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%
Estimated future risk-free rate, minimum			0.63%			2.63%	0.14%	0.16%		0.14%	0.16%	1.32%	0.14%	0.16%	0.52%	0.58%	0.58%
Estimated future risk-free rate	3.27%	1.95%		0.14%	0.16%				1.78%
Estimated future risk-free rate, maximum						3.80%	0.36%	0.34%				3.64%	0.58%	0.58%	1.065%	1.39%	1.26%
Equivalent volatility, minimum			103.00%	70.00%	92.00%	98.00%	44.00%	74.00%			74.00%	79.00%		74.00%	88.00%	79.00%
Equivalent volatility	106.00%	97.00%							98.00%	44.00%			44.00%				88.00%
Equivalent volatility, maximum						99.00%	76.00%	93.00%				96.00%	79.00%	89.00%	90.00%	84.00%
Equivalent risk-free rate, minimum			0.20%			0.93%	0.06%	0.06%		0.06%	0.06%	0.39%	0.06%	0.06%	0.22%	0.20%	0.21%
Equivalent risk-free rate	3.26%	1.31%		0.10%	0.11%				0.59%
Equivalent risk-free rate, maximum						1.16%	0.11%	0.13%			0.06%	1.09%	0.21%	0.23%	0.31%	0.29%	0.32%
Estimated additional shares to be issued upon dilutive event	98,838	7,479