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Sale of future royalties - Liability Activity (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 02, 2019 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2014
Liability Related To Sale Of Future Royalties [Roll Forward] |  |  |  |
Net liability related to sale of future royalties - beginning balance |  | $ 10,365 | $ 16,296 |
Non-cash royalty revenue |  | (1,944) | (3,048) |
Non-cash interest expense |  | 366 | 985 |
Net liability related to sale of future royalties - ending balance |  | 8,787 | $ 14,233 |
ONPATTRO |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |
Royalty interest sold, annual revenue threshold of highest tier | $ 500,000 | $ 500,000 |  | $ 500,000

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