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Debt - Secured Revolving Credit Facility (Details) - Goldman Sachs Bank USA - Revolving Credit Facility - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 100,000,000  
Line of Credit Facility, Borrowings $ 14,923,000 $ 4,444,000