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Debt Obligations - Credit Facility (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 18, 2019
Sep. 30, 2019
Sep. 30, 2019
Nov. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]            
Debt assumed, face value   $ 80,097,000 $ 80,097,000      
Facility amount drawn   3,530,000 3,530,000     $ 0
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt            
Debt Instrument [Line Items]            
Debt assumed, face value $ 10,000,000          
Effective interest rate         5.00%  
Unused borrowing capacity fee, percentage 0.25%          
Facility amount drawn   3,600,000 3,600,000      
Interest expense   $ 57,000 $ 153,000      
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Subsequent Event            
Debt Instrument [Line Items]            
Facility amount drawn       $ 2,800,000    
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Prime Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.50%          
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Floor            
Debt Instrument [Line Items]            
Basis spread on variable rate 5.00%