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Subsequent events (Details) - Subsequent events $ in Millions	Nov. 19, 2021 USD ($)	Nov. 01, 2021 USD ($) item
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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