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Trade and other receivables, net - Charged into restricted bank accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables, net      
Beginning balance $ 359 $ 376 $ 2,510
Increase in restricted bank accounts 733 0 0
Decrease in restricted bank accounts 0 (17) (2,134)
Final balance $ 1,092 $ 359 $ 376