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Prepayments and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Prepayments and other receivables    
VAT receivables $ 376 $ 75
Prepayments 1,175 451
Prepayments to clinical research organizations 418 17
Other receivables 2 32
Total receivables $ 1,971 $ 575