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Summary of significant accounting policies - Liability for Sale of Future Royalties (Details) - USD ($) $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Jul. 17, 2020 | Jul. 31, 2020 | Sep. 30, 2023
Assigned royalty payments |  |  |
Cash consideration received from Royalty Purchase Agreement |  | $ 650.0 |
Assigned royalty payment, retained percentage | 57.067% |  |
Remaining potential milestones that can be achieved |  |  | $ 250.0
Royalty Purchase Agreement | Assigned Royalty Payments |  |  |
Assigned royalty payments |  |  |
Assigned royalty payment, percentage | 42.933% |  |
Cash consideration received from Royalty Purchase Agreement | $ 650.0 |  |
Royalty purchase agreement termination period once there are no further royalty payment obligations | 60 days |  |
Royalty purchase agreement, payment maximum | $ 1,300.0 |  |

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