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Prepaid expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Clinical trial and other development costs | $ 59 |
Insurance | 3,558 |
Other | 0 |
Total prepaid expenses | $ 3,617 | $ 2,499

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