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Share Based Compensation - 2018 Equity Incentive Plan (Narratives) (Details) - shares
12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award    
Share based compensation term (years) 10 years  
Vesting Group One    
Share-based Compensation Arrangement by Share-based Payment Award    
Vesting period (years) 4 years  
Award vesting percentage 25.00%  
Vesting Group One | Performance Based    
Share-based Compensation Arrangement by Share-based Payment Award    
Vesting period (years) 4 years  
Award vesting percentage 25.00%  
Vesting Group Two    
Share-based Compensation Arrangement by Share-based Payment Award    
Vesting period (years) 3 years  
Vesting Group Two | Performance Based    
Share-based Compensation Arrangement by Share-based Payment Award    
Vesting period (years) 3 years  
2018 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award    
Shares authorized for distribution (shares) 14,000,000  
Increase in reserved shares term 10 years  
Periodical increase in authorized shares (percentage)   4.00%
2018 Equity Incentive Plan | Ordinary shares    
Share-based Compensation Arrangement by Share-based Payment Award    
Shares authorized for distribution (shares)   3,281,622
2018 Equity Incentive Plan - New | Ordinary shares    
Share-based Compensation Arrangement by Share-based Payment Award    
Shares authorized for distribution (shares)   3,025,548
2018 Equity Incentive Plan - Shares Available Under 2017 Plan | Ordinary shares    
Share-based Compensation Arrangement by Share-based Payment Award    
Shares authorized for distribution (shares)   256,074