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Stockholders' Equity (Details)	12 Months Ended
Stockholders' Equity (Details)	Sep. 30, 2012	Sep. 30, 2011
Expected term in years	5 years	3 years
Risk-free interest rate	2.64%	3.95%
Expected volatility	93.62%	85.21%
Expected dividend yield	0.00%	0.00%

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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