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Sale of future royalties - Narrative (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended | 72 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 02, 2019 | Jan. 01, 2019 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2016 | Jun. 30, 2025
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Non-cash royalty revenue |  |  | $ 1,223 | $ 1,736 |  |
Non-cash interest expense |  |  | $ 78 | 98 |  |
Minimum |  |  |  |  |  |
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Royalty interest, % interest |  |  | 0.75% |  |  |
Maximum |  |  |  |  |  |
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Royalty interest, % interest |  |  | 1.125% |  |  |
OMERS |  |  |  |  |  |
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Gross proceeds from sale of royalty interest. before advisory fees |  | $ 20,000 |  |  |  |
Entitlement of royalties to be received | $ 30,000 | 30,000 |  |  |  |
Future royalty payments | 30,000 | $ 30,000 |  |  |  |
Transaction costs on sale of royalties | $ 1,500 |  |  |  |  |
Effective annual interest rate on royalty liability |  |  | 2.30% |  |  |
Non-cash royalty revenue |  |  | $ 1,200 | 1,700 |  | $ 26,300
Non-cash interest expense |  |  | $ 100 | $ 100 |  |
OMERS | Minimum |  |  |  |  |  |
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Royalty interest, % interest | 1.00% |  |  |  | 1.00% |
OMERS | Maximum |  |  |  |  |  |
Other Liabilities Disclosure [Line Items] |  |  |  |  |  |
Royalty interest, % interest | 2.33% |  |  |  | 2.33% |

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