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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 4,840   $ 20,159  
Total cash, cash equivalents amd restricted cash $ 4,840 $ 9,790 $ 20,159 $ 11,177