Quarterly report pursuant to Section 13 or 15(d)

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

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Related Party Transaction [Line Items]        
Base management fee $ 862 $ 690 $ 2,741 $ 2,102
Capital gains fee 0 778 0 778
Credits to fees from Adviser 0 (796) (1,542) (970)
Total fees to our Adviser, net 862 672 1,199 1,910
Administration fee 311 387 866 935
Selling commissions and dealer-manager fees 1,657 890 4,781 940
Financing fees 160 57 188 59
Total fees to Gladstone Securities $ 1,817 947 $ 4,969 999
Selling commissions and dealer-manager fees, paid to third parties to date, percentage 93.90%   93.90%  
Taxable REIT Subsidiary        
Related Party Transaction [Line Items]        
Administration fee   18   48
Gladstone Securities        
Related Party Transaction [Line Items]        
Administration fee $ 160 57 $ 188 59
Financing fee (as percent)     0.14%  
Land Advisers | Taxable REIT Subsidiary        
Related Party Transaction [Line Items]        
Base management fee   $ 15   $ 176