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Real Estate - Additional Information (Details)
$ / shares in Units, $ in Thousands, ft² in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
property
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
property
Sep. 30, 2020
property
Sep. 30, 2020
ft²
Sep. 30, 2020
padSite
Sep. 30, 2020
landDevelopment
Jul. 01, 2020
padSite
Jul. 01, 2020
commercialProperty
Jul. 01, 2020
Jul. 01, 2020
commercialLandDevelopment
Jul. 01, 2020
$ / shares
Jun. 30, 2020
USD ($)
Dec. 31, 2019
$ / shares
shares
Sep. 30, 2019
ft²
Sep. 30, 2019
padSite
Sep. 30, 2019
landDevelopment
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Depreciation | $   $ 4,567 $ 4,116 $ 13,239 $ 12,337                            
Amortization expense of in-place lease value intangible | $   2,673 2,873 8,003 8,315                            
Asset management fees | $   $ 0 440 $ 880 1,320                            
Preferred stock, shares issued (in shares)   1,000   1,000                       1,000      
Preferred stock, shares outstanding (in shares)   1,000   1,000                       1,000      
Common stock, shares issued (in shares)   35,306,889   35,306,889                       18,417,687      
Common stock, shares outstanding (in shares)   35,306,889   35,306,889                       18,417,687      
Acquisition costs | $   $ 0 $ 15 $ 132 $ 26                            
Actual revenue included in statements | $       1,270                              
Acquiree loss included in income | $       $ 1,103                              
HIREIT                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Common stock, shares issued (in shares)                               347,826      
Hartman SPE, LLC                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Net asset value | $                             $ 323,934        
Common Stock | HIREIT                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Net asset value (USD per share) | $ / shares                               $ 8.18      
HIREIT Acquisition                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of real estate properties                   1 1                
Consideration | $ $ 117,544                                    
HIREIT Acquisition | Hartman SPE, LLC                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Ownership percentage                       34.38%              
HIREIT Acquisition | Advisor                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Ownership percentage                       30.00%              
HIREIT Acquisition | Common Stock                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Issued (in shares) 9,525,691                                    
HIREIT Acquisition | Common Stock | HIREIT                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Issued (in shares) 12,378,718                                    
Outstanding (in shares) 12,378,718                                    
HIREIT Acquisition | OP Unit | HIROP                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Issued (in shares) 1,214,197                                    
Outstanding (in shares) 1,214,197                                    
HIREIT Acquisition | OP Unit | Hartman XX                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Issued (in shares) 913,346                                    
Hartman XIX                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of real estate properties | commercialLandDevelopment                         2            
Consideration | $ $ 82,688                                    
Acquisition share price (USD per share) | $ / shares                           $ 11.26          
Hartman XIX | Hartman XIX                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Preferred stock, shares issued (in shares) 5,895,967                                    
Preferred stock, shares outstanding (in shares) 5,895,967                                    
Common stock, shares issued (in shares) 100                                    
Common stock, shares outstanding (in shares) 100                                    
Hartman XIX | Hartman SPE, LLC                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Ownership percentage                       26.99%              
Hartman XIX | Common Stock                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Issued (in shares) 7,343,511                                    
Texas                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of commercial properties | property     43   43 44                          
Area of real estate property (in sq ft) | ft²             6.8                   6.7    
Number of real estate properties               4 2                 3 0
Richardson, Arlington And Dallas, Texas                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of real estate properties | property     15   15 15                          
Houston, Texas                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of real estate properties | property     25   25 26                          
San Antonio, Texas                                      
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]                                      
Number of real estate properties | property     3   3 3