Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.10.0.1
Related-Party Transactions - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jun. 11, 2018
Jan. 10, 2018
Apr. 01, 2017
Mar. 31, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
officer
Jun. 30, 2017
USD ($)
Jun. 30, 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% 1.75%            
Hurdle rate, annual     7.00% 7.00%            
Percentage of Pre-Incentive Fee FFO     100.00% 100.00%            
Pre incentive fee, exceeded percentage     2.1875% 2.1875%            
Pre incentive fee, exceeded percentage, annual     8.75% 8.75%            
Percentage Of Pre incentive fee     20.00% 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                   $ 193
Credits to fees from adviser         $ 174 $ 0 $ 174 $ 0    
Administration fee         275 219 549 445    
Management fee         754 530 1,411 924    
Gladstone Securities                    
Related Party Transaction [Line Items]                    
Administration fee             $ 2      
Percentage of financing that will be payable             0.12%      
Taxable REIT Subsidiary                    
Related Party Transaction [Line Items]                    
Professional fees         43   $ 118   $ 189 $ 71
Deferred management fees         28   28   $ 28  
Administration fee         17   30      
Management fee         94   161      
Preferred Stock | Series B Preferred Stock                    
Related Party Transaction [Line Items]                    
Selling commission fee, percentage   7.00%                
Dealer-manager fee, percentage   3.00%                
Management fee         $ 50 $ 0 $ 50 $ 0    
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%      
Ventura County California                    
Related Party Transaction [Line Items]                    
Operating lease, term (in years) 10 years