Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.20.2
Related-Party Transactions - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 20, 2020
Jan. 10, 2018
Apr. 01, 2017
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
officer
Jun. 30, 2019
USD ($)
Related Party Transaction [Line Items]              
Number of executive officers that serve as directors | officer           2  
Pre-Incentive Fee FFO (as percent)           100.00%  
Pre-Incentive Fee, exceeded (as percent)           2.1875%  
Pre-Incentive Fee, exceeded, annual (as percent)           8.75%  
Pre-Incentive Fee (as percent)           20.00%  
Cumulative realized capital gains (as percent)           15.00%  
Notice period for termination of agreement without cause     120 days        
Financing fees       $ 28 $ 26 $ 28 $ 28
Selling commissions and dealer-manager fees       286 1,659 $ 2,770 3,313
Prior Advisory Agreement              
Related Party Transaction [Line Items]              
Management fee (as percent)           2.00%  
Base management fee, quarterly (as percent)           0.50%  
Hurdle rate, quarterly (as percent)           1.75%  
Hurdle rate, annual (as percent)           7.00%  
2020 Advisory Agreement              
Related Party Transaction [Line Items]              
Management fee (as percent)           0.50%  
Base management fee, quarterly (as percent)           0.125%  
Hurdle rate, quarterly (as percent)           1.75%  
Hurdle rate, annual (as percent)           7.00%  
Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)           0.12%  
Financing fees       28 26 $ 28 28
Preferred Stock | Series B Preferred Stock              
Related Party Transaction [Line Items]              
Selling commission fee (as percent)   7.00%          
Dealer-manager fee (as percent)   3.00%          
Preferred Stock | Series C Preferred Stock              
Related Party Transaction [Line Items]              
Selling commission fee (as percent) 6.00%            
Dealer-manager fee (as percent) 3.00%            
Selling commissions and dealer-manager fees       286   286  
Gladstone Securities | Preferred Stock | Series B Preferred Stock              
Related Party Transaction [Line Items]              
Selling commissions and dealer-manager fees       $ 0 $ 1,700 $ 2,500 $ 3,300
Gladstone Securities | Minimum | Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)           0.50%  
Gladstone Securities | Maximum | Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)           1.00%