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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 13,043   $ 6,367  
Restricted Cash     2,350  
Total cash, cash equivalents and restricted cash $ 13,043 $ 6,632 $ 8,717 $ 40,751
Restricted Cash, Statement of Financial Position [Extensible Enumeration] Total cash, cash equivalents and restricted cash      
FSP Monument Circle LLC        
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 2,445