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Portfolio Company Investments - Schedule of Investments Type With Corresponding Percentage of Total Portfolio Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 957,906 [1],[2],[3],[4] $ 860,329 [5],[6],[7],[8]
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 936,629 [1],[2],[3] $ 828,693 [5],[6],[7]
Percentage of Cost 100.00% 100.00%
First Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value [9] $ 578,140 $ 456,105
Percentage of Fair Value [9] 60.30% 53.00%
Investments at cost [9] $ 577,684 $ 453,585
Percentage of Cost [9] 61.60% 54.70%
Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 119,561 $ 182,948
Percentage of Fair Value 12.50% 21.30%
Investments at cost $ 148,806 $ 213,654
Percentage of Cost 15.90% 25.80%
Subordinated Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 135,173 $ 101,456
Percentage of Fair Value 14.10% 11.80%
Investments at cost $ 135,447 $ 100,634
Percentage of Cost 14.50% 12.10%
Equity    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 120,264 $ 117,741
Percentage of Fair Value 12.60% 13.70%
Investments at cost $ 71,740 $ 57,868
Percentage of Cost 7.70% 7.00%
Warrants    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 4,768 $ 2,079
Percentage of Fair Value 0.50% 0.20%
Investments at cost $ 2,952 $ 2,952
Percentage of Cost 0.30% 0.40%
[1]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.

[2]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.

[3]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.

[4]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.

[5]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.

[6]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.

[7]

(c) All debt investments are income producing, unless otherwise indicated.

Equity investments are non-income producing unless otherwise noted.

[8]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.

[9] Includes unitranche investments, which account for 37.6% and 38.5% of our portfolio on a fair value and cost basis as of December 31, 2023, respectively. Includes unitranche investments, which account for 42.1% and 43.4% of our portfolio on a fair value and cost basis as of December 31, 2022, respectively.