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Share-Based Compensation (Details 2)
6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Weighted-average assumptions    
Volatility 81.00% 82.00%
Risk-free interest rate 0.90% 1.10%
Forfeiture rate 10.00% 10.00%
Dividend yield 0.00% 0.00%
Expected life in years 6 years 4 months 24 days 6 years 4 months 24 days