Net loss per share - Computation of diluted net loss per share attributable to common stockholders (Details) - shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Diluted net loss per share attributable to common stockholders | ||||
| Antidilutive securities excluded from computation of diluted weighted average shares outstanding | 5,413,746 | 4,170,879 | 5,413,746 | 4,170,879 |
| 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 | 4,916,402 | 3,673,535 | 4,916,402 | 3,673,535 |
| Warrant liability | ||||
| Diluted net loss per share attributable to common stockholders | ||||
| Antidilutive securities excluded from computation of diluted weighted average shares outstanding | 497,344 | 497,344 | 497,344 | 497,344 |