Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.8.0.1
Related-Party Transactions - Additional Information (Details)
3 Months Ended 5 Months Ended 12 Months Ended
Jan. 10, 2018
Apr. 01, 2017
Mar. 31, 2018
USD ($)
officer
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]            
Number of executive officers that serve as directors | officer     2      
Management fee percent   2.00% 2.00%      
Hurdle rate, quarterly   1.75%        
Hurdle rate, annual   7.00%        
Percentage of Pre-Incentive Fee FFO   100.00%        
Pre incentive fee, exceeded percentage   2.1875%        
Pre incentive fee, exceeded percentage, annual   8.75%        
Percentage Of Pre incentive fee   20.00%        
Base management fee percentage, quarterly   0.50%        
Cumulative realized capital gains   15.00%        
Number of days written notice   120 days        
Deferred management fees     $ 129,000   $ 129,000 $ 193,000
Administration fee [1]     274,000 $ 227,000    
Management fee [1]     $ 656,000 $ 394,000    
Gladstone Securities            
Related Party Transaction [Line Items]            
Percentage of financing that will be payable     0.12%      
Taxable REIT Subsidiary            
Related Party Transaction [Line Items]            
Professional fees     $ 75,000   146,000 $ 71,000
Deferred management fees     80,000   $ 80,000  
Administration fee     12,000      
Management fee     $ 66,000      
Preferred Stock | Series B Preferred Stock            
Related Party Transaction [Line Items]            
Selling commission fee, percentage 7.00%          
Dealer-manager fee, percentage 3.00%          
Minimum | Gladstone Securities            
Related Party Transaction [Line Items]            
Percentage of financing that will be payable   0.50%        
Maximum | Gladstone Securities            
Related Party Transaction [Line Items]            
Percentage of financing that will be payable   1.00%        
[1] Refer to Note 6, “Related-Party Transactions,” for additional information.