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Fair Value Measurements - Summary of Significant Unobservable Inputs by Valuation Technique to Determine Fair Value (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 405,036 $ 368,817
Level 3 | Enterprise Value | EBITDA Multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity Fair Value 118,670 111,808
Equity Investments, Warrants fair value $ 3,576 $ 1,949
Level 3 | Enterprise Value | EBITDA Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 4 4
Equity investments, Warrants range 6 6
Level 3 | Enterprise Value | EBITDA Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 28 16.8
Equity investments, Warrants range 6 6
Level 3 | Enterprise Value | EBITDA Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 9.2 8.1
Equity investments, Warrants range 6 6
Level 3 | Enterprise Value | Revenue Multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity Fair Value $ 6,311 $ 5,623
Equity Investments, Warrants fair value   $ 130
Level 3 | Enterprise Value | Revenue Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 0.8 0.9
Equity investments, Warrants range 4 4.5
Level 3 | Enterprise Value | Revenue Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 7.5 7.8
Equity investments, Warrants range 4 4.5
Level 3 | Enterprise Value | Revenue Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Investments, Equity, Range 6.2 6.4
Equity investments, Warrants range 4 4.5
Level 3 | Subordinated Debt | Discounted Cash Flow | Weighted Average Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 120,782 $ 97,706
Level 3 | Subordinated Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.102 0.10
Level 3 | Subordinated Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.20 0.152
Level 3 | Subordinated Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.133 0.125
Level 3 | Subordinated Debt | Enterprise Value | EBITDA Multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 199 $ 3,750
Level 3 | Subordinated Debt | Enterprise Value | EBITDA Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 6 8.5
Level 3 | Subordinated Debt | Enterprise Value | EBITDA Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 6 8.5
Level 3 | Subordinated Debt | Enterprise Value | EBITDA Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 6 8.5
Level 3 | First Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 507,098 $ 441,830
Level 3 | First Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.094 0.089
Level 3 | First Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.227 0.219
Level 3 | First Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.16 0.155
Level 3 | First Lien Debt | Enterprise Value | Asset Coverage    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 12,416 $ 11,000
Level 3 | First Lien Debt | Enterprise Value | Asset Coverage | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 1.1 1.1
Level 3 | First Lien Debt | Enterprise Value | Asset Coverage | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 1.1 1.1
Level 3 | First Lien Debt | Enterprise Value | Asset Coverage | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 1.1 1.1
Level 3 | First Lien Debt | Enterprise Value | EBITDA Multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 2,775  
Level 3 | First Lien Debt | Enterprise Value | EBITDA Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 4.3  
Level 3 | First Lien Debt | Enterprise Value | EBITDA Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 4.3  
Level 3 | First Lien Debt | Enterprise Value | EBITDA Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 4.3  
Level 3 | First Lien Debt | Enterprise Value | Revenue Multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value   $ 3,275
Level 3 | First Lien Debt | Enterprise Value | Revenue Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   4.3
Level 3 | First Lien Debt | Enterprise Value | Revenue Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   4.3
Level 3 | First Lien Debt | Enterprise Value | Revenue Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   4.3
Level 3 | Second Lien Debt | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 52,200 $ 18,000
Level 3 | Second Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 153,257 $ 180,825
Level 3 | Second Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.12 0.117
Level 3 | Second Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.30 0.25
Level 3 | Second Lien Debt | Discounted Cash Flow | Weighted Average Cost of Capital | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.157 0.145
Level 3 | Second Lien Debt | Enterprise Value | Asset Coverage    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Fair Value $ 1,508 $ 2,123
Level 3 | Second Lien Debt | Enterprise Value | Asset Coverage | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.6 0.8
Level 3 | Second Lien Debt | Enterprise Value | Asset Coverage | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.6 0.8
Level 3 | Second Lien Debt | Enterprise Value | Asset Coverage | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range 0.6 0.8
Level 3 | Second Lien Debt | Enterprise Value | EBITDA Multiples | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   5
Level 3 | Second Lien Debt | Enterprise Value | EBITDA Multiples | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   5
Level 3 | Second Lien Debt | Enterprise Value | EBITDA Multiples | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Investments, Range   5