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Revenue - Disclosure of revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue [abstract]      
Contract revenue $ 2,090 $ 9,979 $ 8,341
Grant revenue 13,528 7,409 3,427
Total revenue $ 15,618 $ 17,388 $ 11,768