Significant agreements - Bayer Collaboration Agreement - Accounting Analysis (Details) - Bayer Collaboration Agreement $ in Thousands	May 04, 2023 USD ($) item
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction price	$ 47,500
Two combined performance obligations related to the licenses and research and development services associated with radiopharmaceutical compounds directed to the first and second targets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Combined performance obligations | item	2
Transaction price	$ 14,976
Material right associated with limited substitution rights for either the first or second target [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction price	$ 1,527
Two material rights associated with the option to progress radiopharmaceutical candidates directed to the first and second targets into further development [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of material rights | item	2
Transaction price	$ 14,691
Two material rights associated with the option to progress a non-radiopharmaceutical compound directed to the first and second targets [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of material rights | item	2
Transaction price	$ 8,703
Material right for the option to expand the collaboration to include a third target and the underlying additional option rights [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Transaction price	$ 7,603