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Revolving Line of Credit (Details) - Revolving line of credit - USD ($)
1 Months Ended 12 Months Ended 19 Months Ended
Aug. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Jul. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 04, 2020
Sep. 28, 2020
Line of Credit Facility [Line Items]                
Line of credit, principal amount         $ 61,958,000 $ 75,393,000    
First Revolving Line Of Credit, Refinanced                
Line of Credit Facility [Line Items]                
Current borrowing capacity     $ 50,000,000         $ 125,000
Line of credit, principal amount     $ 150,000,000       $ 250,000  
Advance rate   90.00% 85.00%          
Gross amount outstanding         61,958,000 75,393,000    
Issuance costs         720,000 1,077,000    
Amount outstanding         61,238,000 $ 74,316,000    
Minimum liquidity amount         $ 50,000      
London Interbank Offered Rate (LIBOR) | First Revolving Line Of Credit, Refinanced                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 7.50%     11.00%        
Minimum | London Interbank Offered Rate (LIBOR) | First Revolving Line Of Credit, Refinanced                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 2.00%