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Investments - Schedule of securities at acquisition reconciliation between purchase price and par value (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Par | $ 46,485 | $ 0 | $ 46,485 | $ 11,970
Discount | (5,425) | 0 | (5,425) | (2,335)
Allowance | (1,593) | 0 | (1,593) | (2,553)
Purchase Price | $ 39,467 | $ 0 | $ 39,467 | $ 7,082

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- Definition Allowance at acquisition + References No definition available. + Details
Name: | ajx_AllowanceAtAcquisition
Namespace Prefix: | ajx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Beneficial interest purchase price + References No definition available. + Details
Name: | ajx_BeneficialInterestPurchasePrice
Namespace Prefix: | ajx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Discount at acquisition + References No definition available. + Details
Name: | ajx_DiscountAtAcquisition
Namespace Prefix: | ajx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Par value at acquisition + References No definition available. + Details
Name: | ajx_ParValueAtAcquisition
Namespace Prefix: | ajx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration