Property and equipment, net - Summary of property and equipment net (Detail) - USD ($) $ in Thousands |
Mar. 31, 2025 |
Jun. 30, 2024 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | $ 1,601 | $ 1,583 |
| Accumulated depreciation and amortization | (1,456) | (1,404) |
| Total property and equipment, net | 145 | 179 |
| Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 6 | 6 |
| Lab equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 1,533 | 1,521 |
| Computer hardware [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 32 | 32 |
| Furniture and fixtures [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | 6 | 0 |
| Leasehold improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property and equipment, gross | $ 24 | $ 24 |