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Goodwill and intangible assets | 12 Months Ended
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Sep. 30, 2021
Goodwill and intangible assets |
Goodwill and intangible assets |
5. | Goodwill and intangible assets
Goodwill and intangible assets increased from prior year by $21.3 million and $18.4 million, respectively, as a result of a business acquisition. See Note 15, “Business acquisition”. There were no changes to the carrying value of goodwill during the year ended September 30, 2020. Total amortization expense related to intangible assets were $0.5 million for the year ended September 30, 2021 and $0.2 million for each of the years ended September 30, 2020 and 2019. 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
​ 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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