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Goodwill and intangible assets (Tables) | 12 Months Ended
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Sep. 30, 2021
Goodwill and intangible assets |
Summary of Intangible Assets Balances | The intangible assets balances are presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021
​ | ​ | Weighted average | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortization period | ​ | carrying | ​ | Accumulated | ​ | Net book
(in thousands, except for years) |  | in years |  | amount |  | amortization |  | value
Developed Technology |  | 16 | ​ | $ | 19,120 | ​ | $ | (1,361) | ​ | $ | 17,759
Tradenames & Trademarks |  | 2 | ​ |  | 20 | ​ |  | (20) | ​ |  | —
Customer Relationships |  | 1.5 | ​ |  | 510 | ​ |  | (7) | ​ |  | 503
Total indefinite-lived intangible assets | ​ | ​ | ​ | $ | 19,650 | ​ | $ | (1,388) | ​ | $ | 18,262
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020
​ | ​ | Weighted average | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortization period | ​ | carrying | ​ | Accumulated | ​ | Net book
(in thousands, except for years) |  | in years |  | amount |  | amortization |  | value
Developed Technology |  | 6 | ​ | $ | 1,220 | ​ | $ | (913) | ​ | $ | 307
Tradenames & Trademarks |  | 2 | ​ |  | 20 | ​ |  | (20) | ​ |  | —
Total indefinite-lived intangible assets | ​ | ​ | ​ | $ | 1,240 | ​ | $ | (933) | ​ | $ | 307
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Future annual amortization expense is as follows (in thousands): ​
​ | ​ | ​ | ​
Years ending September 30, |  | ​ | ​
2022 | ​ | $ | 1,593
2023 | ​ |  | 1,138
2024 | ​ |  | 1,053
2025 | ​ |  | 1,053
2026 | ​ |  | 1,053
Thereafter | ​ |  | 12,372
​ | ​ | $ | 18,262

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