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Stock-based compensation - Additional Information (Details) $ in Millions |  |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2023 shares | May 31, 2021 shares | Jul. 09, 2018 shares | Sep. 30, 2023 shares | Dec. 31, 2022 shares | Sep. 30, 2023 USD ($) shares | Apr. 01, 2022 shares | Jul. 31, 2017
Stock-Based Compensation |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  | 1
Granted (in shares) |  | 125,000 |  | 125,000 | 82,500 | 2,064,526 |  |
Value of stock options exercised | $ |  |  |  |  |  | $ 1.3 |  |
2017 Plan |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 2,659,885 |  | 2,659,885 |  |
Number of shares available for grant |  |  | 2,520,247 | 0 |  | 0 |  |
2018 Plan |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 3,617,968 |  |  |  |  |
Number of shares available for grant |  |  |  | 2,064,858 |  | 2,064,858 |  |
Additional shares authorized (in shares) | 2,646,422 |  |  |  |  |  |  |
Share based payment award percentage of outstanding shares |  |  | 4.00% |  |  |  |  |
2018 Plan | Pre-funded warrants |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  | 9,484,238 |  |  |  |  |
ESPP |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Additional shares authorized (in shares) | 661,605 |  | 697,224 |  |  |  |  |
Share based payment award percentage of outstanding shares |  |  | 1.00% |  |  |  |  |
Common stock reserved for issuance (in shares) | 2,738,208 |  | 348,612 |  |  |  | 2,738,208 |
Stock options |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Exercise price for persons holding ten percent of voting power (as a percent) |  |  |  | 100.00% |  | 100.00% |  |
Exercise price for persons holding more than ten percent of voting power (as a percent) |  |  |  | 110.00% |  | 110.00% |  |
Share based payment award expiration period |  |  |  |  |  | 10 years |  |
Share based payment award vesting period |  |  |  |  |  | 4 years |  |
Stock options | Maximum |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Expiration period for persons holding ten percent of voting power |  |  |  |  |  | 5 years |  |
Stock options | Minimum |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Expiration period for persons holding more than ten percent of voting power |  |  |  |  |  | 10 years |  |
Restricted stock units |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Share based payment award vesting period |  |  |  |  |  | 4 years |  |
Restricted stock unit grant (in shares) |  |  |  |  |  | 1,216,516 |  |
Restricted stock units | Newly-Hired Executive |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |
Restricted stock unit grant (in shares) |  | 88,333 |  | 83,330 | 55,000 |  |  |

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