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Debt - Summary of Interest and Fees Related to Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Instrument [Line Items]      
Stated interest expense $ 4,669 $ 3,888  
Amortization of deferred financing costs 516 524  
Total interest and financing expenses $ 5,185 $ 4,412  
Weighted average stated interest rate, period end 4.244% 3.726%  
Unused commitment fee rate, period end 0.97% 1.375%  
SBA Debentures      
Debt Instrument [Line Items]      
Stated interest expense $ 1,372 $ 739  
Amortization of deferred financing costs 168 138  
Total interest and financing expenses $ 1,540 $ 877  
Weighted average stated interest rate, period end 3.268% 2.846%  
Credit Facility      
Debt Instrument [Line Items]      
Stated interest expense $ 330 $ 363  
Amortization of deferred financing costs 73 112  
Total interest and financing expenses $ 403 $ 475  
Weighted average stated interest rate, period end 7.39% 3.125%  
Unused commitment fee rate, period end 0.97% 1.375%  
Secured Borrowings      
Debt Instrument [Line Items]      
Stated interest expense $ 389 $ 208  
Total interest and financing expenses $ 389 $ 208  
Weighted average stated interest rate, period end 8.685% 4.497% 7.80%
Notes      
Debt Instrument [Line Items]      
Stated interest expense $ 2,578 $ 2,578  
Amortization of deferred financing costs 275 274  
Total interest and financing expenses $ 2,853 $ 2,852  
Weighted average stated interest rate, period end 4.125% 4.125%