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Cash and cash equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Cash and cash equivalents [abstract]    
Pledged cash $ 2,518 $ 2,435
Current restricted cash and cash equivalents 1,268 1,185
Non current restricted cash and cash equivalents $ 1,250 $ 1,250