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Fair value measurement - Valuation techniques and significant unobservable inputs (Details) - Financial liabilities carried at fair value - Level 3 - Warrants - Black- Scholes model
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair value measurement    
Expected term 1 year 7 months 28 days 2 years 1 month 28 days
Risk free rate (as a percent) 0.22% 2.24%