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Debt Obligations - Credit Facility (Details) - USD ($)
3 Months Ended
Apr. 18, 2019
Mar. 31, 2021
Mar. 31, 2020
Apr. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Deferred costs   $ 810,000     $ 880,000
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt          
Debt Instrument [Line Items]          
Debt assumed, face value $ 15,000,000        
Effective interest rate   4.25%      
Amortization of deferred fees and unused fees   $ 17,000 $ 15,000    
Deferred costs   2,000     $ 12,000
Unused borrowing capacity fee, percentage 0.25%        
Facility amount drawn   $ 0      
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Subsequent Event          
Debt Instrument [Line Items]          
Facility amount drawn       $ 0  
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 4.25%