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SHARE-BASED COMPENSATION - Fair value of stock option (Details 1)	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	5 years
Expected dividend yield	0.00%
Forfeiture rate	9.10%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		5 years
Risk-free interest rate	0.70%	0.83%
Expected volatility	70.40%	69.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		3 years
Risk-free interest rate	0.60%	0.04%
Expected volatility	70.00%	63.00%
Expected dividend yield		0.00%
Forfeiture rate		5.00%

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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