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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalent        
Short-term deposits $ 9,965 $ 76,504    
Current bank accounts 90,368 14,365    
Total $ 100,333 $ 90,869 $ 15,818 $ 7,338