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Fair value measurements - Valuation of Derivative Liability (Details) | Dec. 31, 2024 Y | Dec. 31, 2023 Y
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Expected term | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.2 | 0
Expected term | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.4 | 0.4
Volatility | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.551 | 0.432
Volatility | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.599 | 0.832
Risk-free interest rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.054 | 0.052
Risk-free interest rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0.055 | 0.056
Dividend yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0 | 0
Probability of option exercise | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 0 | 0.30
Probability of option exercise | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Liability measurement input | 1 | 1

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