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Debt - Summary of Interest and Fees Related to Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Stated interest expense $ 5,437 $ 4,156 $ 15,168 $ 12,149  
Amortization of deferred financing costs 548 530 1,593 1,588  
Total interest and financing expenses $ 5,985 $ 4,686 $ 16,761 $ 13,737  
Weighted average stated interest rate, period end 4.265% 3.921% 4.265% 3.921%  
Unused commitment fee rate, period end     1.261% 1.20%  
SBA Debentures          
Debt Instrument [Line Items]          
Stated interest expense $ 1,899 $ 933 $ 4,818 $ 2,583  
Amortization of deferred financing costs 191 156 536 438  
Total interest and financing expenses $ 2,090 $ 1,089 $ 5,354 $ 3,021  
Weighted average stated interest rate, period end 4.016% 3.214% 4.016% 3.214%  
Credit Facility          
Debt Instrument [Line Items]          
Stated interest expense $ 541 $ 356 $ 1,396 $ 1,106  
Amortization of deferred financing costs 75 94 222 319  
Total interest and financing expenses 616 450 $ 1,618 $ 1,425  
Unused commitment fee rate, period end     1.261% 1.20%  
Secured Borrowings          
Debt Instrument [Line Items]          
Stated interest expense 419 289 $ 1,220 $ 726  
Total interest and financing expenses $ 419 $ 289 $ 1,220 $ 726  
Weighted average stated interest rate, period end 9.291% 6.446% 9.291% 6.446% 7.80%
Notes          
Debt Instrument [Line Items]          
Stated interest expense $ 2,578 $ 2,578 $ 7,734 $ 7,734  
Amortization of deferred financing costs 282 280 835 831  
Total interest and financing expenses $ 2,860 $ 2,858 $ 8,569 $ 8,565  
Weighted average stated interest rate, period end 4.125% 4.125% 4.125% 4.125%