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Stock-based compensation - Weighted average fair value of options at the date of grant and the intrinsic value of options exercised (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Stock-based compensation |  |  |
Total intrinsic value of options exercised | $ 2,482 | $ 104,559 | $ 17,158
Below Market Price |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | $ 2.58 | $ 12.21 | $ 5.58
Below Market Price | Employees | Preferred stock |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 2.58 | 12.21 | 5.58
At Market Price |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 8.5 | 8.29 | 4.32
At Market Price | Management employees |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 0 | 0 | 0
At Market Price | Employees | Common stock |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 8.5 | 8.29 | 4.32
Above Market Price |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 0 | 0 | 0
Above Market Price | Management employees |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | 0 | 0 | 0
Above Market Price | Employees | Preferred stock |  |  |
Stock-based compensation |  |  |
Options granted with an weighted average exercise price | $ 0 | $ 0 | $ 0

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