<?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="ntla-20261105.xsd" xlink:type="simple"/>
    <context id="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001652130</identifier>
        </entity>
        <period>
            <startDate>2026-11-05</startDate>
            <endDate>2026-11-05</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_2619f1d7-8e52-4d31-89ea-55802eaedfb9">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_bbd4810f-bad3-4aed-9162-51b9c8dee457">0001652130</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_8cd3cb6d-74a3-4e56-a2b5-b29598f9deb7">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_9c671b6a-77c4-4fe4-97fd-844ba66a3d9b">2026-11-05</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_b81c37cb-4302-4203-817a-108403a3f172">INTELLIA THERAPEUTICS, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_37ca5361-4379-4a25-92d8-0c62fa2d04af">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_eaa4cdaf-a818-42d0-aa16-fd6049162420">001-37766</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_fb98c2e1-8a62-4787-bc6b-73b1f4ed96cd">36-4785571</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_69a96a05-1d96-4c9f-ad74-a0243dbfefba">400 Technology Square, Suite 100</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_e59a0249-bc88-4c07-a30d-12d7abacbf8e">Cambridge</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_0aec851c-fe9f-45ff-995a-a61f3c5679b1">MA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_af2c2231-a7df-468b-a123-f09e833dcc61">02139</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_fa1fcf93-0aa9-46e9-9f21-0d88418c30c0">857</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_e9838e9e-a1fe-4f44-9bff-b95f887648e6">285-6200</dei:LocalPhoneNumber>
    <dei:EntityInformationFormerLegalOrRegisteredName
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_f614780f-7c9b-4ee5-ba0b-b3c1127b6fb4">Not Applicable</dei:EntityInformationFormerLegalOrRegisteredName>
    <dei:WrittenCommunications
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_779f28cd-b004-4c1a-b3fe-92cbc6a23669">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_1a4d9690-0b8f-450c-8122-335a64138b0d">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_a8a01dbe-4016-49ee-b7e8-0ea1eb82e2b4">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_a4cf3e26-ae47-49c4-acf7-db8006e03190">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_067f1d50-5419-4503-9ff9-67ac2b752648">Common Stock, par value $0.0001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_f5b5fc3c-eda6-486d-9aba-b1e67471e3a9">NTLA</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_74046ce8-e4cf-414c-a884-6a5075e575e9">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_96ab081f-f5cf-4926-9ddc-ee9fb7d91ce9"
      id="F_e373cf21-9b24-4dcd-8ec8-b152b5617644">false</dei:EntityEmergingGrowthCompany>
</xbrl>
