<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="tcrt-20261005.xsd" xlink:type="simple"/>
    <context id="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001107421</identifier>
        </entity>
        <period>
            <startDate>2026-10-05</startDate>
            <endDate>2026-10-05</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_91131dde-3494-458d-8323-667caec14029">0001107421</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_586d1912-8b34-41fa-ad4d-4b7911f9443e">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_279cc52d-471b-4ad4-8add-b1e2069f2610">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_3c502508-0908-47ee-a993-b6f58dd4c847">2026-10-05</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_c7aa76dc-c10c-4228-bc62-40a1598fc9f7">ALAUNOS THERAPEUTICS, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_e760f025-9c9b-4416-9cec-b3323086365e">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_3c122d80-7da5-4a6e-94e9-9c91040b3dc4">001-33038</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_fa2bcf47-fdff-4ef4-b144-42c19eb4bdd9">84-1475642</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_1f1bcefe-5989-4a22-8e92-af77edad26a2">501 E. Las Olas Blvd</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_c0b2c2e8-987b-4184-957b-d18672392f92">Suite 300</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_a0a19df9-424a-4173-a2a5-e39627f8d6ea">Fort Lauderdale</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_010672ab-15dd-41fa-9d7b-bf842ea487d0">FL</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_a23dddb9-4fe6-4a2f-9e3c-41c6671edcb4">33301</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_40bcd310-fb88-4e4e-8b80-ca539309c128">346</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_ee336c79-2093-440d-b93f-5b5783070a8d">355-4099</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_14b3e1e7-fa4c-43f1-83d9-f9b4bda988df">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_b2919d40-be72-4e18-804b-4cd2287c739f">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_1ae5bcf6-07ab-48b2-a002-bf405514d640">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_51b47ca6-b675-4b8e-87a9-97b0e6eeff30">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_26eb84f1-18cc-48a1-aa55-db7be28fd4d7">Common Stock</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_b49d2557-003d-4f9e-bf56-252ecc6d49a8">TCRT</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_5ea66cac-9961-4472-96aa-13b06a296320">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_8c81d5aa-aee5-42e8-be4b-120db4cf83ef"
      id="F_e0895db4-0b3f-4d36-913a-3983bea28f8a">false</dei:EntityEmergingGrowthCompany>
</xbrl>
