Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.24.0.1
Related-Party Transactions - Additional Information (Detail)
 12 Months Ended
Feb. 20, 2020
Dec. 31, 2023
USD ($)
officer
Dec. 31, 2022
USD ($)
Dec. 31, 2021
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%    
Multiplier   300.00%    
Period prior to termination   24 months    
Prior Advisory Agreement        
Related Party Transaction [Line Items]        
Management fee   0.50%    
Base management fee, quarterly   0.125%    
Financing Arrangement Agreement, Percentage Of Financing Fees Paid        
Related Party Transaction [Line Items]        
Related party transaction, rate   0.14%    
Preferred Stock | Series C Preferred Stock | Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales        
Related Party Transaction [Line Items]        
Related party transaction, rate 6.00%      
Preferred Stock | Series C Preferred Stock | Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales        
Related Party Transaction [Line Items]        
Related party transaction, rate 3.00%      
Preferred Stock | Series E Preferred Stock | Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales        
Related Party Transaction [Line Items]        
Related party transaction, rate 7.00%      
Preferred Stock | Series E Preferred Stock | Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales        
Related Party Transaction [Line Items]        
Related party transaction, rate 3.00%      
Gladstone Securities | Financing Fees        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities | $   $ 0 $ 154,000 $ 166,000
Gladstone Securities        
Related Party Transaction [Line Items]        
Written notice   120 days    
Gladstone Securities | Advisory Agreement - Base Rate, Annualized Rate        
Related Party Transaction [Line Items]        
Management and service fees, base rate   0.60%    
Gladstone Securities | Advisory Agreement - Base Rate, Quarterly Rate        
Related Party Transaction [Line Items]        
Management and service fees, base rate   0.15%    
Gladstone Securities | Advisory Agreement - Incentive Rate, Realized Capital Gains        
Related Party Transaction [Line Items]        
Management and service fees, incentive rate   15.00%    
Gladstone Securities | Minimum | Financing Arrangement Agreement, Percentage Of Financing Obtained        
Related Party Transaction [Line Items]        
Related party transaction, rate   0.50%    
Gladstone Securities | Maximum | Financing Arrangement Agreement, Percentage Of Financing Obtained        
Related Party Transaction [Line Items]        
Related party transaction, rate   1.00%