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Summary of significant accounting policies - Basis of presentation (Details)
Jul. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2020
$ / shares
$ / ¥
shares
Jul. 29, 2019
Mar. 31, 2019
$ / shares
shares
Basis of presentation        
Ratio of share subdivision 8      
Authorized share capital | $ $ 100,000      
Ordinary shares authorized (in shares) 32,000,000,000 32,000,000,000   32,000,000,000
Ordinary shares par value (in USD per share) | $ / shares $ 0.000003125 $ 0.000003125   $ 0.000003125
ADS ratio 8   1  
Convenience translation        
Convenience exchange rate (RMB to USD) | $ / ¥   7.0808    
American Depositary Shares ("ADSs")        
Basis of presentation        
Shares issued (in shares) 0