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Fair Value Measurements - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, assets, level 1 to level 2 transfers, amount $ 0 $ 0 $ 0 $ 0
Fair value, assets, level 2 to level 1 transfers, amount $ 0 $ 0 0 0
Fair value, assets, transfers into level 3, amount     0 0
Fair value, assets, transfers out of level 3, amount     $ 0 $ 0
19 and 10 Portfolio Company Investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Percentage of portfolio investments at fair value 27.60% 29.50% 27.60% 29.50%
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net change in unrealized appreciation (depreciation) on investments $ 1,593,000 $ (36,403,000) $ (4,505,000) $ (42,882,000)