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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 2,449,272,000 | $ 2,488,715,000
Senior debt and 1st lien notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 1,686,411,000 | 1,670,300,000
Subordinated debt and 2nd lien notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 165,455,000 | 238,215,000
Structured Product |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 79,548,000 | 93,038,000
Equity shares |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 409,129,000 | 374,704,000
Equity warrants |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 2,732,000 | 2,392,000
Royalty Rights |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 5,833,000 |
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 2,244,908,000 | 2,237,531,000
Level 3 | Senior debt and 1st lien notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 1,625,501,000 | 1,593,797,000
Level 3 | Senior debt and 1st lien notes | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 1,323,618,000 | $ 1,399,907,000
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Minimum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.065 | 0.078
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Maximum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.758 | 0.196
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Weighted Average | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.105 | 0.117
Level 3 | Senior debt and 1st lien notes | Market Approach | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 50,535,000 | $ 32,150,000
Level 3 | Senior debt and 1st lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.5 | 1.1
Level 3 | Senior debt and 1st lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 11.0 | 12.5
Level 3 | Senior debt and 1st lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 6.3 | 3.7
Level 3 | Senior debt and 1st lien notes | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 247,508,000 | $ 136,594,000
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Minimum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.950 | 0.950
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Maximum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1.000 | 1.000
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Weighted Average | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.987 | 0.979
Level 3 | Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 3,840,000 | $ 25,146,000
Level 3 | Subordinated debt and 2nd lien notes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 153,703,000 | 223,798,000
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 94,912,000 | $ 167,250,000
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Minimum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.080 | 0.085
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Maximum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.186 | 0.189
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Weighted Average | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.127 | 0.135
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 47,775,000 | $ 39,826,000
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.9 | 7.0
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 22.4 | 12.3
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 11.7 | 8.2
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 702,000 | $ 5,875,000
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.980 |
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Minimum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input |  | 0.980
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Maximum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input |  | 1.000
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Weighted Average | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.980 | 0.993
Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 3,791,000 |
Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 3,790,600 |
Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Weighted Average | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 3,790,600 |
Level 3 | Subordinated debt and 2nd lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 6,523,000 | $ 10,847,000
Level 3 | Structured Product |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 48,664,000 | 42,972,000
Level 3 | Structured Product | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 28,904,000 | $ 30,529,000
Level 3 | Structured Product | Yield Analysis | Minimum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.076 | 0.092
Level 3 | Structured Product | Yield Analysis | Maximum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.103 | 0.103
Level 3 | Structured Product | Yield Analysis | Weighted Average | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.082 | 0.097
Level 3 | Structured Product | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 5,250,000 |
Level 3 | Structured Product | Recent Transaction | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1.000 |
Level 3 | Structured Product | Recent Transaction | Weighted Average | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1.000 |
Level 3 | Structured Product | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 1,733,000 |
Level 3 | Structured Product | Expected Recovery | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1,733,300 |
Level 3 | Structured Product | Expected Recovery | Weighted Average | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1,733,300 |
Level 3 | Structured Product | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 12,777,000 | $ 12,443,000
Level 3 | Equity shares |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 408,475,000 | 374,572,000
Level 3 | Equity shares | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 30,302,000 | $ 8,788,000
Level 3 | Equity shares | Yield Analysis | Minimum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.108 | 0.146
Level 3 | Equity shares | Yield Analysis | Maximum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.305 |
Level 3 | Equity shares | Yield Analysis | Weighted Average | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.157 | 0.146
Level 3 | Equity shares | Market Approach | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 339,142,000 | $ 328,210,000
Level 3 | Equity shares | Market Approach | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 1,353,000 | $ 1,771,000
Level 3 | Equity shares | Market Approach | Minimum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.5 | 4.5
Level 3 | Equity shares | Market Approach | Minimum | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 5.5 | 6.5
Level 3 | Equity shares | Market Approach | Maximum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 28.5 | 30.0
Level 3 | Equity shares | Market Approach | Maximum | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 8.8 | 9.5
Level 3 | Equity shares | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 12.9 | 10.6
Level 3 | Equity shares | Market Approach | Weighted Average | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 6.0 | 6.9
Level 3 | Equity shares | Recent Transaction |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 10,008,000 | $ 12,947,000
Level 3 | Equity shares | Recent Transaction | Minimum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1.00 | 1.00
Level 3 | Equity shares | Recent Transaction | Maximum | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1,847.58 | 10.00
Level 3 | Equity shares | Recent Transaction | Weighted Average | Transaction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 1,525.9 | 9.5
Level 3 | Equity shares | Discounted Cash Flow Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 16,852,000 | $ 12,159,000
Input | 0.129 | 0.142
Level 3 | Equity shares | Discounted Cash Flow Analysis | Weighted Average | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.129 | 0.142
Level 3 | Equity shares | Net Asset Approach |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 3,875,000 | $ 3,196,000
Level 3 | Equity shares | Net Asset Approach | Liabilities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 96,678,300 | 55,281,800
Level 3 | Equity shares | Net Asset Approach | Weighted Average | Liabilities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 96,678,300 | 55,281,800
Level 3 | Equity shares | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 59,000 | $ 3,000
Level 3 | Equity shares | Expected Recovery | Minimum | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 2,500 | 2,500
Level 3 | Equity shares | Expected Recovery | Maximum | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 56,900 |
Level 3 | Equity shares | Expected Recovery | Weighted Average | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 54,600 | 2,500
Level 3 | Equity shares | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 6,884,000 | $ 7,498,000
Level 3 | Equity warrants |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | 2,732,000 | 2,392,000
Level 3 | Equity warrants | Market Approach | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 2,729,000 | $ 2,389,000
Level 3 | Equity warrants | Market Approach | Minimum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.5 | 6.3
Level 3 | Equity warrants | Market Approach | Maximum | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 11.8 | 12.5
Level 3 | Equity warrants | Market Approach | Weighted Average | Adjusted EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 8.1 | 7.3
Level 3 | Equity warrants | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 3,000 | $ 3,000
Level 3 | Equity warrants | Expected Recovery | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 3,000.0 | 3,000.0
Level 3 | Equity warrants | Expected Recovery | Weighted Average | Expected Recovery |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 3,000.0 | 3,000.0
Level 3 | Royalty Rights | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total investments at fair value | $ 5,833,000 |
Level 3 | Royalty Rights | Yield Analysis | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.210 |
Level 3 | Royalty Rights | Yield Analysis | Minimum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.186 |
Level 3 | Royalty Rights | Yield Analysis | Maximum | Market Yield |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Input | 0.264 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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