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Investments - Schedule of Investments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments $ 717,341 [1],[2],[3] $ 783,544 [4],[5],[6]
Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 573,888 645,366
Warrant investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 63,728 49,194
Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 79,725 88,984
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 415 656
Level 1 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 1 | Warrant investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 1 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 415 656
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 2 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 2 | Warrant investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 2 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 716,926 782,888
Level 3 | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 573,888 645,366
Level 3 | Warrant investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments 63,728 49,194
Level 3 | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total portfolio company investments $ 79,310 $ 88,328
[1] The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). Unless otherwise indicated, all of the Company’s portfolio company investments are subject to restrictions on sales. As of September 30, 2026, the Company’s portfolio company investments that were subject to restrictions on sales totaled $716.9 million at fair value and represented 210.9% of the Company’s net assets. In addition, unless otherwise indicated, as of September 30, 2026, all investments are pledged as collateral as part of the Company’s revolving credit facility.
[2] Except for equity in three public companies, all investments were valued at fair value using Level 3 significant unobservable inputs as determined in good faith by the Company’s board of directors (the “Board”).
[3] Non-income producing investments.
[4] The Company generally acquires its investments in private transactions exempt from registration under the Securities Act. Unless otherwise indicated, all of the Company’s portfolio company investments are subject to restrictions on sales. As of December 31, 2025, the Company’s portfolio company investments that were subject to restrictions on sales totaled $782.9 million at fair value and represented 221.4% of the Company’s net assets. In addition, unless otherwise indicated, as of December 31, 2025, all investments are pledged as collateral as part of the Company’s revolving credit facility.
[5] Except for equity in four public companies, all investments were valued at fair value using Level 3 significant unobservable inputs as determined in good faith by the Board.
[6] Non-income producing investments.