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Shareholders' equity (Details) € / shares in Units, $ in Thousands | Sep. 30, 2024 USD ($) shares | Sep. 30, 2024 EUR (€) € / shares shares | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share capital | $ | $ 54,034 |  | $ 79,095 | $ 111,654 | $ 140,187 | $ 143,991 | $ 164,240 | $ 179,094 | $ 194,453
Nominal value (in € per share) | € / shares |  | € 0.10 |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share capital | $ 10,979 | € 9,650,153 |  |  |  |  |  |  |
Share capital authorized (in shares) | shares | 96,501,526 | 96,501,526 |  |  |  |  |  |  |

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