Collaboration and license agreements - Summary of allocation of transaction price (Details) $ in Thousands	Sep. 30, 2025 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	$ 23,064
Transaction Price Unsatisfied	12,646
Research and development targets
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	20,688
Transaction Price Unsatisfied	10,270
Option rights
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	2,376
Transaction Price Unsatisfied	$ 2,376