<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2022"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="tpst-20221108.xsd" xlink:type="simple"/>
    <context id="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001544227</identifier>
        </entity>
        <period>
            <startDate>2022-11-11</startDate>
            <endDate>2022-11-11</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl83L2ZyYWc6MDcwNTU2MTVlZmFhNGM1ZTg0NWU0NTFlN2E1NTlhNzYvdGFibGU6ODZiNjMwMzc3NWQzNGJiNjhkMzMzZmQ2YWNkOWVkMjMvdGFibGVyYW5nZTo4NmI2MzAzNzc1ZDM0YmI2OGQzMzNmZDZhY2Q5ZWQyM18wLTEtMS0xLTg5MzIy_579ccd4d-0d3e-46a9-ab07-01ca3b9081c5">0001544227</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl83L2ZyYWc6MDcwNTU2MTVlZmFhNGM1ZTg0NWU0NTFlN2E1NTlhNzYvdGFibGU6ODZiNjMwMzc3NWQzNGJiNjhkMzMzZmQ2YWNkOWVkMjMvdGFibGVyYW5nZTo4NmI2MzAzNzc1ZDM0YmI2OGQzMzNmZDZhY2Q5ZWQyM18xLTEtMS0xLTg5MzIy_b8e6cb06-282a-4de3-b2ac-478cdabd927f">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzky_6f67db7d-bae0-4620-832e-fb588598c336">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk2_429b3a99-ccea-49cb-b6fa-77fd31e30352">2022-11-08</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzkz_acaabb44-b2c2-4b6c-8349-1f2ef2a05d1c">TEMPEST THERAPEUTICS, INC.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6N2NhZjk0MGFiODYzNDY4Yjg5Mzc0NDExM2FkYWFiM2MvdGFibGVyYW5nZTo3Y2FmOTQwYWI4NjM0NjhiODkzNzQ0MTEzYWRhYWIzY18wLTAtMS0xLTg5MzIy_8ce375d2-0595-4321-b6e8-29cc3d055fcc">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6N2NhZjk0MGFiODYzNDY4Yjg5Mzc0NDExM2FkYWFiM2MvdGFibGVyYW5nZTo3Y2FmOTQwYWI4NjM0NjhiODkzNzQ0MTEzYWRhYWIzY18wLTEtMS0xLTg5MzIy_76413b0b-62ae-451b-b75e-6725a2f261f5">001-35890</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6N2NhZjk0MGFiODYzNDY4Yjg5Mzc0NDExM2FkYWFiM2MvdGFibGVyYW5nZTo3Y2FmOTQwYWI4NjM0NjhiODkzNzQ0MTEzYWRhYWIzY18wLTItMS0xLTg5MzIy_ca73701f-8918-4dab-8f9e-e178e602fc44">45-1472564</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzg1_4968147a-1fd7-4b74-b771-e776afecab8c">7000 Shoreline Court</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzg2_ad7ca0be-beea-437b-8c09-8040b01aca4f">Suite 275</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzg3_d02c670e-93a8-4c6b-b184-7fff013ea893">South San Francisco</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk0_ecb4f5a8-bcbb-443d-9073-42a378d69190">CA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk1_ae523612-8869-4985-9111-b408bdcc2e3b">94080</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk3_04045d95-1c8e-435a-9941-1eaaab0e4389">(415)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk4_2cac854c-fb56-4b5c-9dd0-43f859be1035">798-8589</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzg4_7b429aa4-7b07-449d-ad88-caa5b4cab21b">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzkx_b48c4089-1115-479d-8c73-d4ef2f6d5f95">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzg5_6725cb26-cdb3-4df1-b488-ff37926ac180">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzk5_cc007aeb-e0aa-4621-b31d-b12743a63e0f">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6NDNhYjE2MWZlZjRmNGM2MGJlMzA1NmE0N2VhNzczZGIvdGFibGVyYW5nZTo0M2FiMTYxZmVmNGY0YzYwYmUzMDU2YTQ3ZWE3NzNkYl8xLTAtMS0xLTg5MzIy_1587a01a-ce25-4eb0-a845-50933ee5a3b9">Common Stock, par value $0.001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6NDNhYjE2MWZlZjRmNGM2MGJlMzA1NmE0N2VhNzczZGIvdGFibGVyYW5nZTo0M2FiMTYxZmVmNGY0YzYwYmUzMDU2YTQ3ZWE3NzNkYl8xLTItMS0xLTg5MzIy_a3730459-51ba-42a0-91be-19f6c5d5e225">TPST</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGFibGU6NDNhYjE2MWZlZjRmNGM2MGJlMzA1NmE0N2VhNzczZGIvdGFibGVyYW5nZTo0M2FiMTYxZmVmNGY0YzYwYmUzMDU2YTQ3ZWE3NzNkYl8xLTQtMS0xLTg5MzIyL3RleHRyZWdpb246ZGIxZTI4NzIwZTYyNGFjNWE1NDJiODZlNzlhMmZiZjRfOA_fc80cbf4-891c-4dd4-8f2f-58e13f65bfa1">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="i12004e28b8e740c2a42fb78f778b0d18_D20221111-20221111"
      id="id3VybDovL2RvY3MudjEvZG9jOjMxZDk3NzFmNzU3YzQyZDJhYjA5Yjc3MTNiMTJmNjFmL3NlYzozMWQ5NzcxZjc1N2M0MmQyYWIwOWI3NzEzYjEyZjYxZl8xL2ZyYWc6MGM1MjU0ZDk2NzZhNDg5Yzk0ZGI0OTMyNDBjMjM2OGUvdGV4dHJlZ2lvbjowYzUyNTRkOTY3NmE0ODljOTRkYjQ5MzI0MGMyMzY4ZV8xNzkw_3bfc82f7-3225-4da8-bdd4-629e0f5856ff">false</dei:EntityEmergingGrowthCompany>
</xbrl>
