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Warrants And Other Derivatives (Schedule Of The Fair Value Of The Warrants Using The Black-Scholes Option Pricing Model) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Apr. 04, 2012 Securities Purchase Agreement [Member]	Jun. 30, 2012 Securities Purchase Agreement [Member]	Sep. 30, 2012 Securities Purchase Agreement [Member]	Jun. 05, 2012 Loan And Security Agreement [Member]	Jun. 30, 2012 Loan And Security Agreement [Member]	Sep. 30, 2012 Loan And Security Agreement [Member]
Derivative [Line Items]
Risk-free interest rate	0.80%	1.20%	0.90%	1.80%	1.19%	0.77%	0.63%	0.77%	0.80%	0.64%
Expected annual dividend yield					0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected volatility	71.90%	77.60%	71.90%	69.30%	80.00%	80.80%	80.90%	79.90%	80.32%	81.18%
Term	5 years 10 months 24 days	5 years 10 months 24 days	5 years 10 months 24 days	5 years 10 months 24 days	5 years 6 months	5 years 3 months 11 days	5 years 4 days	5 years 6 months	5 years 5 months 9 days	5 years 2 months 5 days
Fair Value					$ 7.0	$ 8.6	$ 7.1	$ 0.4	$ 0.5	$ 0.4

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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