Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail)

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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