Prepaid and other assets - Summary of other current assets (Detail) - USD ($) |
Jun. 30, 2026 |
Jun. 30, 2025 |
|---|---|---|
| Other Assets [Abstract] | ||
| Prepaid expenses | $ 869,000 | $ 655,000 |
| Third-party procured supplies and materials | 738,000 | |
| Market value of listed shares | 0 | 1,000 |
| Total other assets | 1,607,000 | 656,000 |
| Less: non-current portion | (12,000) | (28,000) |
| Current portion | $ 1,595,000 | $ 628,000 |
| X | ||||||||||
- Definition Market value of listed shares. No definition available.
|
| X | ||||||||||
- Definition Third-party procured supplies and materials No definition available.
|
| X | ||||||||||
- Definition Amount of assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of current assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|