Collaboration and license agreements - Summary of allocation of transaction price (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	$ 67,906
Transaction Price Unsatisfied	19,392
Research and development targets
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	61,149
Transaction Price Unsatisfied	17,722
Option rights
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	6,757
Transaction Price Unsatisfied	$ 1,670