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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - Related Party - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Related Party Transaction [Line Items] |  |
Due to related parties | $ 3,874 | $ 4,370
Adviser |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 3,187 | 3,810
Adviser | Base management fee |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 2,156 | 2,141
Adviser | Incentive fee |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 982 | 1,589
Adviser | Other, net |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 49 | 80
Administrator |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 687 | 536
Administrator | Administration fee |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 546 | 536
Administrator | Cumulative accrued but unpaid portions of prior Administration Fees |  |
Related Party Transaction [Line Items] |  |
Due to related parties | 141 | 0
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Due to related parties | $ 0 | $ 24

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