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DEBT OBLIGATIONS - GMSR VFN (Details) - Secured credit facilities - GMSR VFN - USD ($)
Sep. 30, 2021
Aug. 31, 2017
Debt Instrument [Line Items]    
Face amount   $ 65,000,000
Outstanding balance $ 15,000,000  
Maximum    
Debt Instrument [Line Items]    
Face amount   $ 150,000,000