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Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |  |  |  |  |
Investments at amortized cost | $ 3,158,601 | $ 2,939,646 | [1] |  | $ 2,373,435 |
Unamortized debt issuance costs | $ 6,152 | $ 7,899 |  |  | $ 0 |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  |  | $ 0.001 |
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |  |  | 100,000,000 |
Common stock, shares issued (in shares) | 72,018,635 | 70,536,678 |  |  | 56,838,027 |
Common stock, shares outstanding (in shares) | 72,018,635 | 70,536,678 |  | 65,352,831 | 56,838,027 | 15,024,425
[1] | The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.

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