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Related Party Transactions - Revenue and Expenses (Details) - Pillarstone OP [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property operation and maintenance        
Related Party Transaction [Line Items]        
Rent $ (225) $ (213) $ (701) $ (628)
Other revenues        
Related Party Transaction [Line Items]        
Property management fee income 145 228 456 693
Interest, dividend and other investment income        
Related Party Transaction [Line Items]        
Interest income $ 0 $ 52 $ 0 $ 161