Stockholders' equity - Summary of share-based compensation expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||||
| Share-based compensation expense | $ 2,597 | $ 192 | $ 3,975 | $ 376 |
| Research and development [Member] | ||||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||||
| Share-based compensation expense | 302 | 45 | 538 | 112 |
| General and administrative [Member] | ||||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||||
| Share-based compensation expense | $ 2,295 | $ 147 | $ 3,437 | $ 264 |