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Fair Value of Financial Instruments - Significant Level 3 Inputs (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 457,247 | [1],[2] | $ 500,576 | [3],[4]
Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 435,581 |  | 469,753 |
Level 3 | Discounted cash flow | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 234,746 |  | 264,702 |
Level 3 | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 48,043 |  | 53,688 |
Level 3 | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 27,502 |  | 26,413 |
Level 3 | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value |  |  | 16,110 |
Level 3 | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 100 |  |  |
Level 3 | Market approach | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 97 |  | 118 |
Level 3 | Market approach | Loan Accumulation Facility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value |  |  | $ 8,299 |
Level 3 | Discount rates | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 77,105 |  |  |
Level 3 | Discount rates | Minimum | Discounted cash flow | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1032 |  | 0.1021 |
Level 3 | Discount rates | Minimum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1600 |  | 0.1250 |
Level 3 | Discount rates | Minimum | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1075 |  |  |
Level 3 | Discount rates | Maximum | Discounted cash flow | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.2166 |  | 0.2071 |
Level 3 | Discount rates | Maximum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.5800 |  | 0.3400 |
Level 3 | Discount rates | Maximum | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1075 |  |  |
Level 3 | Discount rates | Weighted Average | Discounted cash flow | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1318 |  | 0.1294 |
Level 3 | Discount rates | Weighted Average | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.3224 |  | 0.2214 |
Level 3 | Discount rates | Weighted Average | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1075 |  |  |
Level 3 | EBITDA multiples | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 2,477 |  |  |
Level 3 | EBITDA multiples | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value |  |  | $ 1,226 |
Level 3 | EBITDA multiples | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 11,462 |  | 6,202 |
Level 3 | EBITDA multiples | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 5,445 |  | $ 91,070 |
Level 3 | EBITDA multiples | Minimum | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 12.50 |  |  |
Level 3 | EBITDA multiples | Minimum | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 7.00 |  |  |
Level 3 | EBITDA multiples | Minimum | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input |  |  | 10.50 |
Level 3 | EBITDA multiples | Minimum | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 4.58 |  | 7.25 |
Level 3 | EBITDA multiples | Minimum | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 4.58 |  | 3.72 |
Level 3 | EBITDA multiples | Maximum | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 12.50 |  |  |
Level 3 | EBITDA multiples | Maximum | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 7.00 |  |  |
Level 3 | EBITDA multiples | Maximum | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input |  |  | 10.50 |
Level 3 | EBITDA multiples | Maximum | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 7.50 |  | 7.25 |
Level 3 | EBITDA multiples | Maximum | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 16.50 |  | 11.75 |
Level 3 | EBITDA multiples | Weighted Average | Discounted cash flow | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 12.50 |  |  |
Level 3 | EBITDA multiples | Weighted Average | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 7.00 |  |  |
Level 3 | EBITDA multiples | Weighted Average | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input |  |  | 10.50 |
Level 3 | EBITDA multiples | Weighted Average | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 6.84 |  | 7.25 |
Level 3 | EBITDA multiples | Weighted Average | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 9.55 |  | 9.63 |
Level 3 | Revenue multiples | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 20,255 |  |  |
Level 3 | Revenue multiples | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | 344 |  | $ 1,901 |
Level 3 | Revenue multiples | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 358 |  | $ 24 |
Level 3 | Revenue multiples | Minimum | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.40 |  | 0.46 |
Level 3 | Revenue multiples | Minimum | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.23 |  |  |
Level 3 | Revenue multiples | Minimum | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1326 |  | 0.15 |
Level 3 | Revenue multiples | Minimum | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.40 |  | 0.15 |
Level 3 | Revenue multiples | Maximum | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 1.40 |  | 0.70 |
Level 3 | Revenue multiples | Maximum | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.23 |  |  |
Level 3 | Revenue multiples | Maximum | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1326 |  | 0.87 |
Level 3 | Revenue multiples | Maximum | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.70 |  | 0.87 |
Level 3 | Revenue multiples | Weighted Average | Market approach | Senior secured |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.59 |  | 0.56 |
Level 3 | Revenue multiples | Weighted Average | Market approach | Subordinated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.23 |  |  |
Level 3 | Revenue multiples | Weighted Average | Market approach | Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1326 |  | 0.87 |
Level 3 | Revenue multiples | Weighted Average | Market approach | Common equity, warrants and other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.70 |  | 0.15 |
Level 3 | Constant default rate | Minimum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0200 |  | 0.0200 |
Level 3 | Constant default rate | Minimum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0200 |  | 0.0200 |
Level 3 | Constant default rate | Maximum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0200 |  | 0.0200 |
Level 3 | Constant default rate | Maximum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0300 |  | 0.0300 |
Level 3 | Constant default rate | Weighted Average | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0200 |  | 0.0200 |
Level 3 | Constant default rate | Weighted Average | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0203 |  | 0.0203 |
Level 3 | Recovery rate | Minimum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Recovery rate | Minimum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Recovery rate | Maximum | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Recovery rate | Maximum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Recovery rate | Weighted Average | Discounted cash flow | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Recovery rate | Weighted Average | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.6500 |  | 0.6500 |
Level 3 | Discount margin | Minimum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0685 |  | 0.0725 |
Level 3 | Discount margin | Maximum | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.1025 |  | 0.1160 |
Level 3 | Discount margin | Weighted Average | Discounted cash flow | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value, measurement input | 0.0804 |  | 0.0858 |
Level 3 | Transaction Price | Market approach | Subordinated notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 4,840 |  |  |
Level 3 | Transaction Price | Market approach | Mezzanine debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, at fair value | $ 2,807 |  |  |
[1] | Unless otherwise noted in footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.
[2] | Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.
[3] | Unless otherwise noted with footnote 14, fair value was determined using significant unobservable inputs for all of the Company’s investments and are considered Level 3 under GAAP. See Note 5 for further details.
[4] | Equity ownership may be held in shares or units of companies affiliated with the portfolio company. The Company’s investments are generally classified as “restricted securities” as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144.

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