Commitments, contingencies and other liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) multiple	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2017 USD ($)
Commitments contingencies and other liabilities
Contingency reserves for litigation liabilities		$ 0.0	$ 0.0
Non-profit organization agreement
Commitments contingencies and other liabilities
Maximum funding	$ 4.0
Funding multiple | multiple	2.6
Milestone payment liability				$ 1.0