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Net loss per share - Computation of diluted net loss per share attributable to common stockholders (Details) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Diluted net loss per share attributable to common stockholders    
Antidilutive securities excluded from computation of diluted weighted average shares outstanding 6,973,503 5,461,725
Options to purchase common stock    
Diluted net loss per share attributable to common stockholders    
Antidilutive securities excluded from computation of diluted weighted average shares outstanding 6,476,159 4,964,381
Warrants to purchase convertible preferred stock    
Diluted net loss per share attributable to common stockholders    
Antidilutive securities excluded from computation of diluted weighted average shares outstanding 497,344 497,344