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Fair value of financial instruments - Derivative Liability Assumptions (Details)	Sep. 30, 2025	May 25, 2025
Probability of change in control event
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.800	0.800
Weighted average discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.178	0.184

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