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Fair Value of Financial Instruments - Summary of Company's Assets Measured at Fair Value by Investment Type on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value $ 1,344,283 $ 1,268,428
Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,363,862 1,275,180
Escrow Receivable 2,441 2,441
Cash and cash equivalents 11,967 4,761
Total 1,378,270 1,282,382
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 13,607 795
Cash and cash equivalents 11,967 4,761
Total 25,574 5,556
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,363 2,326
Total 1,363 2,326
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,344,283 1,268,428
Escrow Receivable 2,441 2,441
Total 1,346,724 1,270,869
Fair Value, Recurring | Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 4,609 3,631
Total 4,609 3,631
Fair Value, Recurring | Secured Loans    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,010,841 885,299
Fair Value, Recurring | Secured Loans | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,010,841 885,299
Fair Value, Recurring | Equipment Financing    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 277,550 336,778
Fair Value, Recurring | Equipment Financing | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 277,550 336,778
Fair Value, Recurring | Warrants    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 39,930 33,527
Fair Value, Recurring | Warrants | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 1,363 2,326
Fair Value, Recurring | Warrants | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 38,567 31,201
Fair Value, Recurring | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 35,541 19,576
Fair Value, Recurring | Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 13,607 795
Fair Value, Recurring | Equity | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value 17,325 15,150
Fair Value, Recurring | Equity | Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total Investments at fair value $ 4,609 $ 3,631