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Fair value of financial instruments - Derivative Liability Assumptions (Details) | Sep. 30, 2025 | May 25, 2025
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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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