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Fair Value of Financial Instruments - Investment Portfolio Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value $ 457,247 [1],[2] $ 500,576 [3],[4]
Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 279,244 312,862
Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 94,714 99,196
Structured Finance Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 83,289 88,518
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 1 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 1 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 1 | Structured Finance Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 21,666 30,823
Level 2 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 21,666 30,823
Level 2 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 2 | Structured Finance Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 435,581 469,753
Level 3 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 257,578 282,039
Level 3 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value 94,714 99,196
Level 3 | Structured Finance Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, at fair value $ 83,289 $ 88,518
[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.