Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.20.4
Subsequent Events - Additional Information (Detail)
 2 Months Ended 12 Months Ended
Feb. 11, 2021
USD ($)
Jan. 22, 2021
USD ($)
ft²
tenant
Feb. 16, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Jul. 02, 2019
USD ($)
Jul. 01, 2019
USD ($)
Oct. 27, 2017
USD ($)
Oct. 26, 2017
USD ($)
Oct. 31, 2015
USD ($)
Subsequent Event [Line Items]                  
Rent obligations deferred, percentage       2.00%          
Line of credit facility, maximum borrowing capacity         $ 160,000,000.0 $ 75,000,000.0 $ 75,000,000.0 $ 25,000,000.0  
Line of credit                  
Subsequent Event [Line Items]                  
Line of credit facility, maximum borrowing capacity                 $ 85,000,000.0
Subsequent Event | New Term Loan Facility                  
Subsequent Event [Line Items]                  
Line of credit facility, maximum borrowing capacity $ 65,000,000.0                
Line of credit facility, delayed funding component $ 15,000,000.0                
Subsequent Event | New Term Loan Facility | LIBOR                  
Subsequent Event [Line Items]                  
Floor on LIBOR (as percent) 0.25%                
Subsequent Event | New Term Loan Facility | Line of credit                  
Subsequent Event [Line Items]                  
Debt instrument term 60 months                
Subsequent Event | Property Maturing February 15, 2031 | New fixed rate mortgage notes payable                  
Subsequent Event [Line Items]                  
Debt issued   $ 5,500,000              
Stated interest rate (as a percent)   3.24%              
Subsequent Event | Findlay, Ohio                  
Subsequent Event [Line Items]                  
Aggregate Square Footage | ft²   180,152              
Payments to acquire real estate   $ 11,100,000              
Number of tenants | tenant   1              
Lease term   14 years 2 months 12 days              
Common Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Net proceeds from sale of shares     $ 6,800,000            
Number of shares sold (in shares) | shares     400,000            
Preferred Stock | Series F Preferred Stock                  
Subsequent Event [Line Items]                  
Net proceeds from sale of shares       $ 2,700,000          
Number of shares sold (in shares) | shares       100,000          
Preferred Stock | Series F Preferred Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Net proceeds from sale of shares     $ 30,000.00            
Number of shares sold (in shares) | shares     1,200