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Share-based Compensation (Summary of Stock Options Outstanding and Exercisable) (Details) - USD ($)
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Exercised   0
Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Outstanding at Beginning of Period 7,027,989  
Number of Shares Granted 2,140,327  
Number of Shares Exercised (1,666)  
Number of Shares Forfeited (158,201)  
Number of Shares Outstanding at End of Period 9,008,449  
Number of Shares Exercisable at End of Period 3,358,771  
Weighted Average Exercise Price Per Share, Outstanding at Beginning of Period $ 1.58  
Weighted Average Exercise Price Per Share, Granted 1.92  
Weighted Average Exercise Price Per Share, Exercised 1.05  
Weighted Average Exercise Price Per Share, Forfeited 1.50  
Weighted Average Exercise Price Per Share, Outstanding at End of Period 1.66  
Weighted Average Exercise Price Per Share, Exercisable at End of Period $ 1.45  
Weighted Average Remaining Contractual Term, Outstanding at End of Period 8 years 2 months 19 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 7 years 2 months 16 days  
Aggregate Intrinsic Value, Outstanding at End of Period $ 15,215,966  
Aggregate Intrinsic Value, Exercisable at End of Period $ 6,387,894