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Subsequent events (Details) - shares | Oct. 31, 2024 | Oct. 30, 2024 | Sep. 30, 2024 | Aug. 26, 2024 | Aug. 25, 2024 | Dec. 31, 2023
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Subsequent events |  |  |  |  |  |
Number of authorized shares of common stock |  |  | 14,000,000 | 14,000,000 | 350,000,000 | 14,000,000
Subsequent events |  |  |  |  |  |
Subsequent events |  |  |  |  |  |
Number of authorized shares of common stock | 350,000,000 |  |  |  |  |
Subsequent events | 2020 Stock Plan | Employees |  |  |  |  |  |
Subsequent events |  |  |  |  |  |
Common stock (in shares) | 2,500,000 | 280,000 |  |  |  |
Subsequent events | 2020 Stock Plan | Non-employee |  |  |  |  |  |
Subsequent events |  |  |  |  |  |
Common stock (in shares) |  | 250,000 |  |  |  |

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