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Cash and cash equivalents and Restricted cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash and cash equivalents [abstract]        
Cash on hand $ 36 $ 13    
Cash at banks 74,734 19,024    
Total $ 74,770 $ 19,037 $ 18,227 $ 2,366