Stock Based Compensation - Classification of expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Share-Based Compensation | ||||
| Stock-based compensation expense | $ 2,344 | $ 880 | $ 5,935 | $ 1,823 |
| Total unrecognized compensation cost | 18,483 | $ 18,483 | ||
| Expenses expected to be recognized over a weighted average remaining period | 2 years 8 months 12 days | |||
| Research and development expenses | ||||
| Share-Based Compensation | ||||
| Stock-based compensation expense | 1,318 | 473 | $ 2,974 | 989 |
| General and administrative expenses | ||||
| Share-Based Compensation | ||||
| Stock-based compensation expense | $ 1,026 | $ 407 | $ 2,961 | $ 834 |