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Related-Party Transactions - Schedule of the Total Selling Commissions and Dealer-Manager Fees Paid (Details) - Selling Commissions and Dealer Management Fees - Gladstone Securities - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |
Total due to related parties | $ 9 | $ 215 | $ 39 | $ 547
Series E Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total due to related parties | $ 9 | $ 215 | $ 39 | $ 547

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