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Debt Obligations - Credit Facility (Details) - Line of Credit - Valley National Bank - Credit Facility, Maturing April 2021 - Secured Debt - USD ($)
Apr. 18, 2019
Jun. 01, 2020
May 21, 2020
Mar. 31, 2020
Dec. 31, 2019
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       $ 0  
Subsequent Event          
Debt Instrument [Line Items]          
Facility amount drawn   $ 5,000,000 $ 5,000,000    
Prime Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
Floor          
Debt Instrument [Line Items]          
Basis spread on variable rate 5.00%