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Subsequent events (Details) - Subsequent events $ in Millions | Nov. 19, 2021 USD ($) | Nov. 01, 2021 USD ($) item
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Asset License and Contract Assignment Agreement with Revelar |  |
Subsequent Event [Line Items] |  |
Success-based milestone payments based on achievement |  | $ 100.0
Maximum number of additional antibody therapeutics under license | item |  | 5
License period |  | 4 years
Maximum committed investment |  | $ 10.0
Percentage of undiluted ownership excluding shares and options |  | 49.80%
SAFE investment in exchange for cash investment |  | $ 5.0
AbX Biologics, Inc. |  |
Subsequent Event [Line Items] |  |
Purchase consideration | $ 140.0 |
Cash consideration | 10.0 |
Contingent payment | $ 40.0 |

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