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Cash and cash equivalents and Restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents [abstract]        
Cash on hand $ 25 $ 13    
Cash at banks 45,188 19,024    
Total $ 45,213 $ 19,037 $ 2,366 $ 46