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Cash and cash equivalents and Restricted cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Cash and cash equivalents [abstract]        
Cash on hand $ 27 $ 25    
Cash at banks 43,611 45,188    
Total $ 43,638 $ 45,213 $ 74,770 $ 19,037