<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>377</ContextCount>
  <ElementCount>448</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>139</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - Condensed Consolidated Statements of Comprehensive Loss (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveLossUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Loss (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - Condensed Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfStockholdersEquity1</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfStockholdersEquityParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>75070 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Organization and Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/OrganizationAndDescriptionOfBusiness</Role>
      <ShortName>Organization and Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Basis of Presentation, Consolidation and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureBasisOfPresentationConsolidationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Basis of Presentation, Consolidation and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntities</Role>
      <ShortName>Variable Interest Entities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestments1</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Notes Receivable</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/NotesReceivable</Role>
      <ShortName>Notes Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurement</Role>
      <ShortName>Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Prepaid Expenses and Other Current Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/PrepaidExpensesAndOtherCurrentAssets</Role>
      <ShortName>Prepaid Expenses and Other Current Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipment</Role>
      <ShortName>Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Intangible Assets, Goodwill, and Digital Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssets</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Accrued Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/AccruedLiabilities</Role>
      <ShortName>Accrued Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureDebt1</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureNetLossPerShare1</Role>
      <ShortName>Net Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995645 - Disclosure - License Agreements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/LicenseAgreements</Role>
      <ShortName>License Agreements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Government Grant</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureGovernmentGrant</Role>
      <ShortName>Government Grant</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Defined Contribution Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DefinedContributionPlan</Role>
      <ShortName>Defined Contribution Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Corporate Restructuring</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuring</Role>
      <ShortName>Corporate Restructuring</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995695 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Basis of Presentation, Consolidation and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureBasisOfPresentationConsolidationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Basis of Presentation, Consolidation and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureBasisOfPresentationConsolidationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitions</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995745 - Disclosure - Variable Interest Entities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntitiesTables</Role>
      <ShortName>Variable Interest Entities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntities</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestments1</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995765 - Disclosure - Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurementTables</Role>
      <ShortName>Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurement</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Prepaid Expenses and Other Current Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/PrepaidExpensesAndOtherCurrentAssetsTables</Role>
      <ShortName>Prepaid Expenses and Other Current Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/PrepaidExpensesAndOtherCurrentAssets</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipmentTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipment</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Intangible Assets, Goodwill, and Digital Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsTables</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssets</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Accrued Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/AccruedLiabilitiesTables</Role>
      <ShortName>Accrued Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/AccruedLiabilities</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeases</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/StockBasedCompensation</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureNetLossPerShareTables</Role>
      <ShortName>Net Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureNetLossPerShare1</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995865 - Disclosure - Corporate Restructuring (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuringTables</Role>
      <ShortName>Corporate Restructuring (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuring</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReportingTables</Role>
      <ShortName>Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReporting</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Organization and Description of Business - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/OrganizationAndDescriptionOfBusinessAdditionalInformationDetail</Role>
      <ShortName>Organization and Description of Business - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995895 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995915 - Disclosure - Revenue (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureRevenueAdditionalInformationDetails</Role>
      <ShortName>Revenue (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureRevenue</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995925 - Disclosure - Acquisitions - Schedule of preliminary allocation of the IGX purchase price to the estimated fair value of the net assets acquired at the acquisition date (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsScheduleOfPreliminaryAllocationOfTheIgxPurchasePriceToTheEstimatedFairValueOfTheNetAssetsAcquiredAtTheAcquisition</Role>
      <ShortName>Acquisitions - Schedule of preliminary allocation of the IGX purchase price to the estimated fair value of the net assets acquired at the acquisition date (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995935 - Disclosure - Acquisitions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail</Role>
      <ShortName>Acquisitions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995945 - Disclosure - Acquisitions - Schedule of fair values of consideration paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsScheduleOfFairValuesOfConsiderationPaidDetails</Role>
      <ShortName>Acquisitions - Schedule of fair values of consideration paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995955 - Disclosure - Acquisitions - Schedule of fair values of consideration paid (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsScheduleOfFairValuesOfConsiderationPaidParentheticalDetails</Role>
      <ShortName>Acquisitions - Schedule of fair values of consideration paid (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995965 - Disclosure - Acquisitions - Schedule of Fair values of consideration paid, Black-Scholes Option (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsScheduleOfFairValuesOfConsiderationPaidBlackscholesOptionParentheticalDetails</Role>
      <ShortName>Acquisitions - Schedule of Fair values of consideration paid, Black-Scholes Option (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995975 - Disclosure - Acquisitions - Summary of identifiable assets and liabilities recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureAcquisitionsSummaryOfIdentifiableAssetsAndLiabilitiesRecognizedDetails</Role>
      <ShortName>Acquisitions - Summary of identifiable assets and liabilities recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995995 - Disclosure - Variable Interest Entities - Summary of Primary Beneficiary for VIEs Consolidated Under the VIE Model (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntitiesSummaryOfPrimaryBeneficiaryForViesConsolidatedUnderTheVieModelDetail</Role>
      <ShortName>Variable Interest Entities - Summary of Primary Beneficiary for VIEs Consolidated Under the VIE Model (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Variable Interest Entities - Summary of the Assets and Liabilities for all Consolidated VIEs (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntitiesSummaryOfTheAssetsAndLiabilitiesForAllConsolidatedViesDetail</Role>
      <ShortName>Variable Interest Entities - Summary of the Assets and Liabilities for all Consolidated VIEs (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Variable Interest Entities - Schedule of Non Controlling Interest Recognized to Its Consolidated VIEs Roll Forward (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureVariableInterestEntitiesScheduleOfNonControllingInterestRecognizedToItsConsolidatedViesRollForwardDetail</Role>
      <ShortName>Variable Interest Entities - Schedule of Non Controlling Interest Recognized to Its Consolidated VIEs Roll Forward (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996065 - Disclosure - Investments - Summary of financial data for investments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsSummaryOfFinancialDataForInvestmentsDetail</Role>
      <ShortName>Investments - Summary of financial data for investments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996075 - Disclosure - Investments - Summary of Statements of operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsSummaryOfStatementsOfOperationsDetail</Role>
      <ShortName>Investments - Summary of Statements of operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996085 - Disclosure - Investments - COMPASS Pathways plc (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsCompassPathwaysPlcAdditionalInformationDetails</Role>
      <ShortName>Investments - COMPASS Pathways plc (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996095 - Disclosure - Investments - (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsAdditionalInformationDetails</Role>
      <ShortName>Investments - (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureInvestmentsTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996105 - Disclosure - Notes Receivable - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/NotesReceivableAdditionalInformationDetail</Role>
      <ShortName>Notes Receivable - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996115 - Disclosure - Fair Value Measurement - Summary of Fair Value Measurement on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurementSummaryOfFairValueMeasurementOnRecurringBasisDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Fair Value Measurement on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996135 - Disclosure - Fair Value Measurement - Summary of Fair Value Measurement Inputs and Valuation Techniques (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurementSummaryOfFairValueMeasurementInputsAndValuationTechniquesDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Fair Value Measurement Inputs and Valuation Techniques (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996145 - Disclosure - Fair Value Measurement - Summary of Fair Value Measurement on Recurring Basis, Unobservable Input Reconciliation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurementSummaryOfFairValueMeasurementOnRecurringBasisUnobservableInputReconciliationDetail</Role>
      <ShortName>Fair Value Measurement - Summary of Fair Value Measurement on Recurring Basis, Unobservable Input Reconciliation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996155 - Disclosure - Fair Value Measurement - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/FairValueMeasurementAdditionalInformationDetail</Role>
      <ShortName>Fair Value Measurement - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996165 - Disclosure - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/PrepaidExpensesAndOtherCurrentAssetsSummaryOfPrepaidExpensesAndOtherCurrentAssetsDetail</Role>
      <ShortName>Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996175 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails</Role>
      <ShortName>Property and Equipment - Schedule of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996185 - Disclosure - Property and Equipment (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails</Role>
      <ShortName>Property and Equipment (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosurePropertyAndEquipmentTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996195 - Disclosure - Intangible Assets, Goodwill, and Digital Assets - Intangible Assets Consisted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsIntangibleAssetsConsistedDetails</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets - Intangible Assets Consisted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996205 - Disclosure - Intangible Assets, Goodwill, and Digital Assets - Estimated Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsEstimatedFutureAmortizationExpenseDetails</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets - Estimated Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996215 - Disclosure - Intangible Assets, Goodwill, and Digital Assets - Company's digital assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsCompanysDigitalAssetsDetails</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets - Company's digital assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996225 - Disclosure - Intangible Assets, Goodwill, and Digital Assets (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsAdditionalInformationDetails</Role>
      <ShortName>Intangible Assets, Goodwill, and Digital Assets (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureIntangibleAssetsGoodwillAndDigitalAssetsTables</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996235 - Disclosure - Accrued Liabilities - Summary of Accrued Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/AccruedLiabilitiesSummaryOfAccruedLiabilitiesDetail</Role>
      <ShortName>Accrued Liabilities - Summary of Accrued Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996245 - Disclosure - Leases (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesAdditionalInformationDetails</Role>
      <ShortName>Leases (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesTables</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996255 - Disclosure - Leases - Schedule of operating leases assets and liabilities lessee (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesScheduleOfOperatingLeasesAssetsAndLiabilitiesLesseeDetails</Role>
      <ShortName>Leases - Schedule of operating leases assets and liabilities lessee (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996265 - Disclosure - Leases - Components of expenses related to leases is recorded on a straight-line basis over the lease term (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesComponentsOfExpensesRelatedToLeasesIsRecordedOnAStraightlineBasisOverTheLeaseTermDetails</Role>
      <ShortName>Leases - Components of expenses related to leases is recorded on a straight-line basis over the lease term (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996275 - Disclosure - Leases - Schedule of future minimum commitments maturity operating leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesScheduleOfFutureMinimumCommitmentsMaturityOperatingLeasesDetails</Role>
      <ShortName>Leases - Schedule of future minimum commitments maturity operating leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996295 - Disclosure - Leases - Schedule of supplemental cash flow information related to operating leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureLeasesScheduleOfSupplementalCashFlowInformationRelatedToOperatingLeasesDetails</Role>
      <ShortName>Leases - Schedule of supplemental cash flow information related to operating leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996315 - Disclosure - Debt - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureDebtAdditionalInformationDetail</Role>
      <ShortName>Debt - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996325 - Disclosure - Debt - Summary of Grant Date Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureDebtSummaryOfGrantDateFairValueDetails</Role>
      <ShortName>Debt - Summary of Grant Date Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996345 - Disclosure - Stockholders' Equity - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail</Role>
      <ShortName>Stockholders' Equity - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996355 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StockBasedCompensationAdditionalInformationDetail</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996365 - Disclosure - Stock-Based Compensation - Summary of Share Based Payment Arrangement Option Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockbasedCompensationSummaryOfShareBasedPaymentArrangementOptionActivityDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Share Based Payment Arrangement Option Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996375 - Disclosure - Stock-Based Compensation - Summery of Vested and Non vested Option Outstanding (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockbasedCompensationSummeryOfVestedAndNonVestedOptionOutstandingParentheticalDetails</Role>
      <ShortName>Stock-Based Compensation - Summery of Vested and Non vested Option Outstanding (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996385 - Disclosure - Stock-Based Compensation - Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockbasedCompensationScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsDetail</Role>
      <ShortName>Stock-Based Compensation - Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996405 - Disclosure - Stock-Based Compensation - Summary of Restricted Common Stock Awards Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockbasedCompensationSummaryOfRestrictedCommonStockAwardsActivityDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Restricted Common Stock Awards Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996415 - Disclosure - Stock-Based Compensation - Summary of Employee Stock Ownership Plan (ESOP) Disclosures (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/StockBasedCompensationSummaryOfEmployeeStockOwnershipPlanEsopDisclosuresDetail</Role>
      <ShortName>Stock-Based Compensation - Summary of Employee Stock Ownership Plan (ESOP) Disclosures (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996425 - Disclosure - Stock-Based Compensation - Summary of Restricted Stock Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureStockbasedCompensationSummaryOfRestrictedStockAwardsDetails</Role>
      <ShortName>Stock-Based Compensation - Summary of Restricted Stock Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996435 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/IncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996445 - Disclosure - Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureNetLossPerShareSummaryOfBasicAndDilutedNetLossPerShareDetail</Role>
      <ShortName>Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996455 - Disclosure - Net Loss Per Share - Schedule of Computation of Diluted net Income (Loss) Per Share Attributable to Common Shareholders (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureNetLossPerShareScheduleOfComputationOfDilutedNetIncomeLossPerShareAttributableToCommonShareholdersDetail</Role>
      <ShortName>Net Loss Per Share - Schedule of Computation of Diluted net Income (Loss) Per Share Attributable to Common Shareholders (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996475 - Disclosure - License Agreements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/LicenseAgreementsAdditionalInformationDetail</Role>
      <ShortName>License Agreements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>996485 - Disclosure - Related Party Transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/RelatedPartyTransactionsAdditionalInformationDetail</Role>
      <ShortName>Related Party Transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>996495 - Disclosure - Government Grant (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureGovernmentGrantAdditionalInformationDetails</Role>
      <ShortName>Government Grant (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureGovernmentGrant</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>996505 - Disclosure - Defined Contribution Plan (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureDefinedContributionPlanAdditionalInformationDetails</Role>
      <ShortName>Defined Contribution Plan (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DefinedContributionPlan</ParentRole>
      <Position>100</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>996515 - Disclosure - Corporate Restructuring (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuringAdditionalInformationDetails</Role>
      <ShortName>Corporate Restructuring (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuringTables</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>996525 - Disclosure - Corporate Restructuring - Schedule Of Reconciliation Of The Cash Restructuring Charges And Related Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureCorporateRestructuringScheduleOfReconciliationOfTheCashRestructuringChargesAndRelatedPaymentsDetails</Role>
      <ShortName>Corporate Restructuring - Schedule Of Reconciliation Of The Cash Restructuring Charges And Related Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>996535 - Disclosure - Segment Reporting - Schedule of Reportable Segment Net Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReportingScheduleOfReportableSegmentNetLossDetails</Role>
      <ShortName>Segment Reporting - Schedule of Reportable Segment Net Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="atai-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>996545 - Disclosure - Segment Reporting (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReportingAdditionalInformationDetails</Role>
      <ShortName>Segment Reporting (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://ataibeckley.com/20260331/taxonomy/role/DisclosureSegmentReportingTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="atai-20260331.htm">atai-20260331.htm</File>
    <File>atai-20260331.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img165310728_0.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="917">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="32">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="10">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
