Stockholders' equity - Summary of share-based compensation expense (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | $ 26,410 | $ 17,426 |
| Research and development [Member] | ||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | 8,575 | 2,299 |
| General and administrative [Member] | ||
| Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] | ||
| Share-based compensation expense | $ 17,835 | $ 15,127 |