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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Related Party Transactions [Abstract] |  |
Base management fee | $ 2,149 | $ 2,141
Incentive fee | 0 | 1,589
Other, net | 60 | 80
Total due to Adviser | 2,209 | 3,810
Administration fee | 575 | 536
Cumulative accrued but unpaid portions of prior Administration Fees | 242 | 0
Total due to Administrator | 817 | 536
Total due to Gladstone Securities | 8 | 24
Due to related parties, net | $ 3,034 | $ 4,370

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