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)

v3.10.0.1
Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Management fee $ 736 $ 666
Capital gains fee (150) 0
Credits to fees (44) 0
Other due to Adviser 63 16
Total due to Adviser 605 682
Administration fee 340 258
Total due to Administrator 340 258
Total due to related parties 945 940
Taxable REIT Subsidiary    
Related Party Transaction [Line Items]    
Administration fee 9 22
Gladstone Securities    
Related Party Transaction [Line Items]    
Due from Gladstone Securities $ 20 $ 0