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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Details) - Related Party - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Related Party Transaction [Line Items] |  |
Total due to related parties | $ 3,620 | $ 4,370
Adviser |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | 3,001 | 3,810
Administrator |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | 619 | 536
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | 0 | 24
Base management fee | Adviser |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | 2,150 | 2,141
Incentive fee | Adviser |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | 789 | 1,589
Other, net | Adviser |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | $ 62 | $ 80

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