Segment and Customer Reporting (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Segment and Customer Reporting | ||||
| Large format batteries | $ 17,694 | $ 17,053 | $ 51,244 | $ 42,514 |
| Other | 21 | 80 | 74 | 806 |
| Total of Large format batteries | $ 17,715 | $ 17,133 | $ 51,318 | $ 43,320 |