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Organization and Basis of Presentation (Details Textuals) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 22, 2019 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) numberOfLoanPools | Jun. 30, 2020 USD ($) payment numberOfLoanPools | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 numberOfLoanPools | Dec. 31, 2018
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Number of payments made on RPL mortgage loans (at least) | payment |  |  | 5 |  |  |
Number of Recent Payments Made on RPL Mortgage Loans | payment |  |  | 7 |  |  |
Number of payments made on NPL mortgage loans | payment |  |  | 3 |  |  |
Number of non controlling interest subsidiaries | numberOfLoanPools |  | 4 | 4 |  | 4 |
Percentage of ownership interests in joint venture |  | 34.00% | 34.00% |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ |  | $ 130,000,000.0 | $ 124,977,000 | $ 0 |  |
Percentage of outstanding OP units owned |  | 100.00% | 100.00% |  | 100.00% | 96.80%
Percentage of outstanding OP owned by an unaffiliated holder |  |  |  |  |  | 3.20%
Operating partnership units | shares |  |  |  | 624,106 |  |
Maximum |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Principal balance of small balance commercial mortgage loans (up to) | $ |  | $ 5,000,000.0 | $ 5,000,000.0 |  |  |
Delaware Trust |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Ownership percentage |  | 5.00% | 5.00% |  |  |
2018-C | Great Ajax Corp |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 63.00% | 63.00% |  | 63.00% |
2017-D |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 50.00% | 50.00% |  |  |
2017-D | Great Ajax Corp |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 50.00% | 50.00% |  | 50.00% |
AS Ajax E II LLC |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 53.10% | 53.10% |  | 53.10% |
AS Ajax E II LLC | Third Party |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 46.90% | 46.90% |  |  |
Great Ajax II REIT |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Company ownership percentage |  |  | 99.80% |  |  |
Great Ajax II REIT | Third Party |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 0.20% | 0.20% |  |  |
Great Ajax II REIT | Great Ajax Corp |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 99.80% |
Gaea |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Ownership percentage | 23.20% |  |  |  |  |
Share Price | $ / shares | $ 15.00 |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ | $ 66,300,000 |  |  |  |  |
Private placement share issuance | shares | 4,419,641 |  |  |  |  |
Gaea | Third Party |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 76.80% |  |  |  |  |
Thetis |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Ownership percentage |  | 19.80% | 19.80% |  |  |
Great Ajax FS |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Ownership percentage |  | 8.00% | 8.00% |  |  |

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