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Stock Options - Summary of Grant-date Fair Value of Stock Options Granted and Assumptions Used Binomial Models (Details) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]    
Grant-date fair value $ 3.25
Volatility factor 55.26% 0.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate 2.91% 0.00%
Expected term (in years) 6 years 2 months 30 days 0 years