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) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Base management fee $ 881 $ 736
Incentive fee 847 0
Capital gains fee 0 (150)
Credits to fees 0 (44)
Other, net 25 63
Total due to Adviser 1,753 605
Administration fee 341 340
Cumulative accrued but unpaid portions of prior Administration Fees 75 0
Total due to Administrator 416 340
Total due to related parties 2,169 945
Taxable REIT Subsidiary    
Related Party Transaction [Line Items]    
Administration fee 9  
Gladstone Securities    
Related Party Transaction [Line Items]    
Due from Gladstone Securities $ 0 $ 20