Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail)

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Base management fee $ 3,623 $ 2,837
Incentive fee 847 0
Capital gains fee 0 628
Credits to fees from Adviser (1,543) (1,014)
Total fees to our Adviser, net 2,927 2,451
Administration fee 1,207 1,275
Payment of management fees 7,645 2,324
Financing fee 235 83
Total fees to Gladstone Securities 7,880 2,407
Taxable REIT Subsidiary    
Related Party Transaction [Line Items]    
Administration fee 57 57
Land Advisers | Taxable REIT Subsidiary    
Related Party Transaction [Line Items]    
Base management fee 176 176
Gladstone Securities    
Related Party Transaction [Line Items]    
Financing fee $ 235 $ 83
Financing fee (as percent) 0.14%