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Debt Obligations - Credit Facility (Details) - Line of Credit - Valley National Bank - Credit Facility, Maturing April 2021 - Secured Debt - Subsequent Event - USD ($)
Apr. 18, 2019
May 02, 2019
Debt Instrument [Line Items]    
Debt assumed, face value $ 10,000,000  
Effective interest rate   6.00%
Unused borrowing capacity fee, percentage 0.25%  
Trussville, AL    
Debt Instrument [Line Items]    
Facility amount drawn   $ 9,000,000
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%