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Stockholders equity - Offerings (Details) - 2022 Sales Agreement - USD ($) |  | 3 Months Ended
--- | --- | ---
Apr. 08, 2022 | Mar. 31, 2024
Shareholders' equity |  |
Remaining amount under the Sales Agreement |  | $ 156,228,841
Issuance of shares upon completion of public offering, net of issuance costs (in shares) |  | 163,669,056
Sold shares represented by American Depositary Shares (in shares) |  | 27,278,176
Net proceeds |  | $ 29,149,648
Maximum |  |
Shareholders' equity |  |
Aggregate offering price of ADS shares under At The Market sales agreement | $ 200,000,000 |

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