Sale of future royalties - Liability Activity (Details) - USD ($) $ in Thousands |
6 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jul. 02, 2019 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Sep. 30, 2017 |
|
| Liability Related To Sale Of Future Royalties [Roll Forward] | ||||
| Net liability related to sale of future royalties - beginning balance | $ 3,442 | $ 4,829 | ||
| Non-cash royalty revenue | (361) | (974) | ||
| Non-cash interest expense | 30 | 55 | ||
| Net liability related to sale of future royalties - ending balance | 3,111 | 3,910 | ||
| Research and Development Arrangement, Contract to Perform for Others [Line Items] | ||||
| Non-cash interest expense | 30 | 55 | ||
| 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 | |
| OMERS | ||||
| Liability Related To Sale Of Future Royalties [Roll Forward] | ||||
| Non-cash interest expense | 100 | 100 | ||
| Research and Development Arrangement, Contract to Perform for Others [Line Items] | ||||
| Non-cash interest expense | $ 100 | $ 100 | ||