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Trade and other receivables, net - Charged into restricted bank accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Trade and other receivables, net      
Beginning balance $ 376 $ 2,510 $ 2,782
Increase in restricted bank accounts     166
Decrease in restricted bank accounts $ (17) (2,134) (438)
Final balance   $ 376 $ 2,510