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Share-based Compensation - Schedule of Fair Value Assumptions (Details) - USD ($)
6 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield $ 0 $ 0 $ 0 $ 0
Expected volatility 37.70%   50.00% 110.00%
Expected term (years) 6 years 1 month 6 days   2 years 6 months 3 years 9 months
Risk-free interest rate 1.90%   2.34% 1.67%
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility   50.00%    
Expected term (years)   1 year    
Risk-free interest rate   2.33%    
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility   60.00%    
Expected term (years)   1 year 6 months    
Risk-free interest rate   2.40%