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Cash and cash equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]    
Fair value of cash and cash equivalents $ 46 $ 2,756
Undrawn borrowing facilities 12,800 3,000
Pledged cash 1,350 210
Fair value of restricted cash and cash equivalents $ 1,350 $ 210