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Portfolio Company Investments - Schedule of Debt Investment on Non-Accrual Status (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | $ 12,492 | $ 10,267
Fair Value | K2 Merger Agreement Agent, LLC (fka K2 Industrial Services, Inc.) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 1,508 | 2,123
Fair Value | Allredi, LLC (fka Marco Group International OpCo, LLC) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total |  | 8,144
Fair Value | Suited Connector LLC |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 5,025 |
Fair Value | Virtex Enterprises, LP |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 5,959 |
Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 34,787 | 27,204
Cost | EBL, LLC (EbLens) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total |  | 9,332
Cost | US GreenFiber, LLC |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 5,223 | 5,223
Cost | K2 Merger Agreement Agent, LLC (fka K2 Industrial Services, Inc.) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 2,368 | 2,368
Cost | Allredi, LLC (fka Marco Group International OpCo, LLC) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total |  | $ 10,281
Cost | Suited Connector LLC |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | 15,933 |
Cost | Virtex Enterprises, LP |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | $ 11,263 |

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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