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Mortgage Notes Payable (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]            
Gain on extinguishment of debt   $ 0 $ 0 $ 262,000 $ 0  
Mortgage notes payable, net   $ 0   $ 0   $ 47,074,000
Mortgages            
Debt Instrument [Line Items]            
Mortgage notes payable, net $ 0          
Yale West | Mortgages            
Debt Instrument [Line Items]            
Prepayment of mortgage note 45,600,000          
Gain on extinguishment of debt 500,000          
Write-off of unamortized premium 1,400,000          
Prepayment penalty $ 900,000