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Summary of significant accounting policies - Liability for Sale of Future Royalties (Details) - USD ($) $ in Millions | Jul. 17, 2020 | Jun. 30, 2021
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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 |  | $ 335.0
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 | 60 days |
Royalty purchase agreement, payment maximum | $ 1,300.0 |

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- Details
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