Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Details)

v3.19.2
Equity - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended 27 Months Ended 47 Months Ended
Jun. 20, 2019
USD ($)
$ / shares
shares
May 31, 2018
USD ($)
$ / shares
shares
Apr. 12, 2017
USD ($)
security
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
shares
Mar. 31, 2018
shares
Jan. 10, 2018
shares
Jan. 09, 2018
shares
Dec. 31, 2017
shares
Aug. 07, 2015
USD ($)
$ / shares
Subsidiary, Sale of Stock [Line Items]                              
Stock authorized and unissued (in shares)                       6,500,000      
Common stock, shares authorized (in shares)       91,500,000 91,500,000   91,500,000 91,500,000 91,500,000       98,000,000    
Preferred stock, liquidation value | $       $ 65,900,000 $ 65,900,000   $ 28,600,000 $ 65,900,000 $ 65,900,000            
Common stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001   $ 0.001 $ 0.001 $ 0.001            
Common stock, shares issued (in shares)       20,532,770 20,532,770   17,891,340 20,532,770 20,532,770            
Common stock, shares outstanding (in shares)       20,532,770 20,532,770   17,891,340 20,532,770 20,532,770            
Maximum number of securities that can be sold (in securities) | security     2                        
Proceeds from issuance of preferred and common equity | $         $ 61,394,000 $ 25,113,000                  
Discounts and offering expenses | $         4,521,000 $ 935,000                  
Stock Redeemed or Called During Period, Value | $       $ 153,000 $ 166,000                    
June 2019 Offering                              
Subsidiary, Sale of Stock [Line Items]                              
Securities allowed for issuance (amount up to) | $ $ 23,500,000                            
Maximum amount authorized in Primary Offering (in shares) 2,000,000                            
Proceeds from issuance of preferred stock | $ $ 22,300,000                            
Average sales price price (in dollars per share) | $ / shares $ 11.73                            
2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Proceeds from issuance of preferred and common equity | $               $ 91,900,000              
ATM Program                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, shares issued (in shares)       1,666,142 1,666,142     1,666,142 1,666,142            
Common stock, value authorized | $                             $ 30,000,000.0
Sale of common stock sold under sale agreement (in shares)                 70,551            
Average sales price price (in dollars per share) | $ / shares       $ 12.86 $ 12.86     $ 12.86 $ 12.86           $ 12.65
Common stock, value, outstanding | $       $ 21,400,000 $ 21,400,000     $ 21,400,000 $ 21,400,000           $ 893,000
Common stock, value, issued | $       $ 21,100,000 $ 21,100,000     $ 21,100,000 $ 21,100,000           $ 879,000
Common Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001   $ 0.001 $ 0.001 $ 0.001            
Common stock, shares issued (in shares)       20,532,770 20,532,770   17,891,340 20,532,770 20,532,770            
Common stock, shares outstanding (in shares)       20,532,770 20,532,770 16,023,872 17,891,340 20,532,770 20,532,770 18,462,219 15,216,199     13,791,574  
Common Stock | 2017 Registration Statement                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock, shares issued (in shares)       7,466,581 7,466,581     7,466,581 7,466,581            
Common stock issued (in shares)               1,215,565              
Securities allowed for issuance (amount up to) | $     $ 300,000,000                        
Series B Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, shares authorized (in shares)       6,500,000 6,500,000   6,500,000 6,500,000 6,500,000            
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001   $ 0.001 $ 0.001 $ 0.001            
Preferred stock, shares issued (in shares)       2,636,068 2,636,068   1,144,393 2,636,068 2,636,068            
Preferred stock, shares outstanding (in shares)       2,636,068 2,636,068   1,144,393 2,636,068 2,636,068            
Series B Preferred Stock | Preferred Stock                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, shares outstanding (in shares)       2,636,068 2,636,068 20,280 1,144,393 2,636,068 2,636,068 1,891,709 0     0  
Common stock issued (in shares)         7,400                    
Securities allowed for issuance (amount up to) | $   $ 150,000,000                          
Maximum amount authorized in Primary Offering (in shares)   6,000,000                          
Dividend rate (as percent)   6.00%                          
Average sales price of common stock sold (in dollars per share) | $ / shares   $ 25   $ 22.50 $ 22.50     $ 22.50 $ 22.50            
Proceeds from issuance of preferred stock | $   $ 131,300,000     $ 37,000,000     $ 65,100,000              
Discounts and offering expenses | $         995,000                    
Net proceeds from issuance of stock | $         $ 33,700,000                    
Sale of common stock sold under sale agreement (in shares)         1,499,075     2,643,468              
OP Unit Holder                              
Subsidiary, Sale of Stock [Line Items]                              
Company's ownership percent (as percent)       100.00% 100.00%   96.90% 100.00% 100.00%            
Minimum period required to exercise, in months         12 months                    
Gladstone Land Limited Partnership                              
Subsidiary, Sale of Stock [Line Items]                              
OP units held by non-controlling limited partners (in shares)         0   570,879