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Fair value measurements - Financing Note (Details) - Financing Note | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 $ / shares Y | Dec. 31, 2023 Y $ / shares
Fair Value measurements |  |
Maturity date | Dec. 19, 2026 | Dec. 19, 2026
Principal |  |
Fair Value measurements |  |
Debt instrument, measurement input | 2,330 | 6,805,000
Discount rate |  |
Fair Value measurements |  |
Debt instrument, measurement input | 0.2500 | 0.2000
Note term |  |
Fair Value measurements |  |
Debt instrument, measurement input | Y | 2.72 | 2.97
Stock Price |  |
Fair Value measurements |  |
Debt instrument, measurement input | $ / shares | 2.26 | 3.35
Risk rate |  |
Fair Value measurements |  |
Debt instrument, measurement input | 0.0434 | 0.0392
Volatility |  |
Fair Value measurements |  |
Debt instrument, measurement input | 0.3633 | 0.3249

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