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Equity - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]          
Common stock shares outstanding (in shares)   22,142,143 18,909,874    
Common stock par value per share (in dollars per share)   $ 0.01 $ 0.01    
Common stock shares authorized (in shares)   125,000,000 125,000,000    
Preferred stock shares outstanding (in shares)   0 0    
Preferred stock shares authorized (in shares)   25,000,000 25,000,000    
Treasury Stock, Shares   33,248 20,277    
Sale of common stock pursuant to dividend reinvestment plan   $ 280,000 $ 199,000 $ 174,000  
Common stock shares issued (in shares)   22,142,143 18,909,874    
Conversion of Operating Partnership Units $ 10,800,000 $ 0      
Units of Partnership Interest, Amount   624,106 624,106    
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy   three      
At-the-Market Program          
Class of Stock [Line Items]          
Common stock authorized   $ 50,000,000.0      
Proceeds from issuance of common stock   $ 34,300,000      
Common stock shares issued (in shares)   2,278,518 0    
Common Stock          
Class of Stock [Line Items]          
Common stock shares outstanding (in shares)   22,142,143 18,909,874 18,588,228 18,122,387
Issuance of shares under dividend reinvestment (in shares)   20,107 14,953 12,710  
Sale of common stock pursuant to dividend reinvestment plan   $ 300,000 $ 200,000    
Conversion of Operating Partnership Units   $ 6,000      
BLFD Holding LLC | Great Ajax Corp          
Class of Stock [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent   90.00%      
BLFD Holding LLC | Third Party Institutional Investor          
Class of Stock [Line Items]          
Ownership percentage by noncontrolling owners   10.00%      
AS Ajax E II LLC          
Class of Stock [Line Items]          
Percentage of ownership interests in joint venture   53.10%      
Ownership percentage   5.00%      
AS Ajax E II LLC | Third Party          
Class of Stock [Line Items]          
Ownership percentage by noncontrolling owners   46.90%      
Securitization Trust, 2017-D | Great Ajax Corp          
Class of Stock [Line Items]          
Percentage of ownership interests in joint venture   50.00%      
Noncontrolling Interest, Ownership Percentage by Parent   50.00%      
2018-C | Great Ajax Corp          
Class of Stock [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent   63.00%      
2018-C | Third Party Institutional Investor          
Class of Stock [Line Items]          
Ownership percentage by noncontrolling owners   37.00%      
DG Brooklyn Holdings | Great Ajax Corp          
Class of Stock [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent   95.00%      
DG Brooklyn Holdings | Third Party          
Class of Stock [Line Items]          
Ownership percentage by noncontrolling owners   5.00%