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Prepaid expenses and other current assets - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Prepaid Expenses and Other Current Assets [Line Items]    
Prepaid research and development expenses $ 2,050 $ 4,555
Other Noncurrent Assets    
Prepaid Expenses and Other Current Assets [Line Items]    
Prepaid research and development expenses $ 100 $ 1,700