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Debt Obligations - Components of obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Jul. 09, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2019
Line of Credit Facility [Line Items]          
Outstanding face amount/Carrying value $ 20,613,000   $ 14,625,000    
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Outstanding face amount/Carrying value 20,613,000 $ 20,613,000 $ 14,625,000 $ 11,811,000  
Maximum facility size $ 30,000,000       $ 15,000,000
Weighted average funding cost 5.10%        
Weighted average life 1 year 3 months 18 days