<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2023"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="axsm-20230807.xsd" xlink:type="simple"/>
    <context id="C_bbe9c9a2-c612-4ad2-8fab-03189464a928">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001579428</identifier>
        </entity>
        <period>
            <startDate>2023-08-07</startDate>
            <endDate>2023-08-07</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_54dad056-232a-433b-bb82-c56efb32e4e2">0001579428</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_9ada9e53-dc65-4e03-9d6f-aeae07b4f7a5">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_d47f4e02-4137-43b4-8ac9-4d9b94126f4a">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_857abb1a-e502-4d4f-bb6e-542feeafd9ef">2023-08-07</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_1e693cdf-4e4c-4d45-93bf-0c223c9b94d1">Axsome Therapeutics, Inc.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_31e1f3a1-fb9a-423c-adb0-8155c8781fe2">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_32451173-5440-474f-89cf-07b933c90f3b">001-37635</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_69ca5d80-68cc-4301-9527-10b4d0dd940b">45-4241907</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_8c2d4cd6-0173-42c9-8b24-66cde38c7c5b">One World Trade Center, 22nd Floor</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_4d9c5026-f42b-4ae5-bbaa-56d6ab31b22f">New York</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_3f554a2b-2ca7-45ac-b70a-d78ddffb2935">NY</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_2702b988-4838-4f9f-bebd-0f3e43e758cb">10007</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_a68743b1-e17f-4bea-b5df-c692f8b66ef0">(212)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_2e7e9284-61ff-4fcd-bc01-42ccd07d8a22">332-3241</dei:LocalPhoneNumber>
    <dei:EntityInformationFormerLegalOrRegisteredName
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_420c8ad8-0692-4485-b86f-88421dd0030b">Axsome Therapeutics, Inc.</dei:EntityInformationFormerLegalOrRegisteredName>
    <dei:WrittenCommunications
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_b5a832e4-3502-4ec0-a0c3-ee2aaea8b329">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_fb35febe-6eba-476c-8a64-23254a8d71b2">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_8c966a05-a25a-47eb-8154-13745209228c">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_eff24216-1808-4c1b-9d63-c6043ec37eb8">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_e4df356e-45bd-44fc-bc35-6efb2bcc74e3">Common Stock, Par Value $0.0001 Per Share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_57286cb9-0ba5-4272-9777-7f9bf938c169">AXSM</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_c362c178-1d17-4bcf-80e9-96cab04ef9d0">NASDAQ</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_bbe9c9a2-c612-4ad2-8fab-03189464a928"
      id="F_b85e9658-4b64-4211-af7a-381677b52dcc">false</dei:EntityEmergingGrowthCompany>
</xbrl>
