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Share-based Compensation (Weighted Average Assumptions for Options Granted) (Details) - Stock Option [Member] - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Volatility 65.66% 65.45% 63.13% 66.88%
Expected Dividend Yield 0.00% 0.00% 0.00% 0.00%
Risk-free Interest Rate 0.62% 2.27% 1.63% 2.59%
Expected Term (in years) 6 years 5 years 10 months 24 days 5 years 10 months 24 days 5 years 8 months 12 days
Fair Value of Options Granted $ 1.84 $ 0.90 $ 1.14 $ 0.85