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 [Member]
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