Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.22.0.1
Related-Party Transactions - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Feb. 20, 2020
Dec. 31, 2021
USD ($)
officer
Dec. 31, 2020
USD ($)
Related Party Transaction [Line Items]      
Number of executive officers that serve as directors | officer   2  
Hurdle rate, quarterly   1.75%  
Hurdle rate, annual   7.00%  
Pre-incentive Fee FFO   100.00%  
Pre-Incentive Fee, exceeded   2.1875%  
Pre-Incentive Fee, exceeded, annual   8.75%  
Pre-Incentive Fee   20.00%  
Cumulative realized capital gains   15.00%  
Written notice   120 days  
Financing fee   $ 166 $ 262
Dealer-manager fees   $ 4,961 4,711
Prior Advisory Agreement      
Related Party Transaction [Line Items]      
Management fee   0.50%  
Base management fee, quarterly   0.125%  
Current Advisory Agreement      
Related Party Transaction [Line Items]      
Management fee   0.60%  
Base management fee, quarterly   0.15%  
Gladstone Securities      
Related Party Transaction [Line Items]      
Financing fee   0.14%  
Preferred Stock | Series B Preferred Stock      
Related Party Transaction [Line Items]      
Selling commission fee 7.00%    
Dealer-manager fee 3.00%    
Preferred Stock | Series B Preferred Stock | Gladstone Securities      
Related Party Transaction [Line Items]      
Dealer-manager fees     2,500
Preferred Stock | Series C Preferred Stock      
Related Party Transaction [Line Items]      
Selling commission fee 6.00%    
Dealer-manager fee 3.00%    
Dealer-manager fees   $ 5,000 $ 2,200
Gladstone Securities | Minimum | Gladstone Securities      
Related Party Transaction [Line Items]      
Financing fee   0.50%  
Gladstone Securities | Maximum | Gladstone Securities      
Related Party Transaction [Line Items]      
Financing fee   1.00%