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Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) DebtInvestment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) DebtInvestment InvesteeCompany | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) DebtInvestment InvesteeCompany
Purchase of investments | $ 3,000 | $ 10,400 | $ 54,084 | $ 33,539 |
Repayments and sales of investments | 14,600 | 23,800 | 82,206 | 100,358 |
Net repayment and sales amount of investment | $ 11,600 | $ 13,400 | $ 28,100 | $ 66,900 |
Number of investee companies where investments held | InvesteeCompany |  |  | 95 |  | 100
Percentage of investment portfolio valuation |  |  | 100.00% |  |
Number of debt investments on non-accrual status | DebtInvestment | 9 |  | 9 |  | 7
Aggregate amortized cost of debt investments on non-accrual status | $ 22,500 |  | $ 22,500 |  | $ 17,300
Investment at fair value | 428,978 |  | 428,978 |  | 467,865
Aggregate fair value of debt investments on non-accrual status | $ 6,900 |  | $ 6,900 |  | $ 6,100
Percentage of investments in non-accrual status at amortized cost | 4.50% |  | 4.50% |  | 3.20%
Percentage of investments in non-accrual status at fair value | 1.60% |  | 1.60% |  | 1.30%

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