Fair value of financial instruments - Derivative Liability Assumptions (Details)	Dec. 31, 2025	May 25, 2025	May 26, 2024
Probability of change in control event
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.800	0.800	0.800
Weighted average discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.176	0.184	0.214

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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