<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>283</ContextCount>
  <ElementCount>541</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>110</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Disclosure - Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureOperations</Role>
      <ShortName>Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Product Revenue Reserves and Allowances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowances</Role>
      <ShortName>Product Revenue Reserves and Allowances</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureInventory</Role>
      <ShortName>Inventory</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Accrued Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureAccruedExpenses</Role>
      <ShortName>Accrued Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Loan Agreements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLoanAgreements</Role>
      <ShortName>Loan Agreements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Share-Based Payment Awards</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwards</Role>
      <ShortName>Share-Based Payment Awards</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - License and Asset Purchase Agreements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLicenseAndAssetPurchaseAgreements</Role>
      <ShortName>License and Asset Purchase Agreements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Retirement Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureRetirementPlans</Role>
      <ShortName>Retirement Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureContingencies</Role>
      <ShortName>Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Segment and Geographic Area Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSegmentAndGeographicAreaInformation</Role>
      <ShortName>Segment and Geographic Area Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPoliciesTables</Role>
      <ShortName>Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Product Revenue Reserves and Allowances (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowancesTables</Role>
      <ShortName>Product Revenue Reserves and Allowances (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowances</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Inventory (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureInventoryTables</Role>
      <ShortName>Inventory (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureInventory</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssets</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Accrued Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureAccruedExpensesTables</Role>
      <ShortName>Accrued Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureAccruedExpenses</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeases</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquity</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Share-Based Payment Awards (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsTables</Role>
      <ShortName>Share-Based Payment Awards (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwards</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureFairValueMeasurements</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxes</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Segment and Geographic Area Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSegmentAndGeographicAreaInformationTables</Role>
      <ShortName>Segment and Geographic Area Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSegmentAndGeographicAreaInformation</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Operations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureOperationsAdditionalInformationDetail</Role>
      <ShortName>Operations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Significant Accounting Policies - Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSignificantAccountingPoliciesPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesDetail</Role>
      <ShortName>Significant Accounting Policies - Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Product Revenue Reserves and Allowances - Disaggregation of Revenue (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowancesDisaggregationOfRevenueDetail</Role>
      <ShortName>Product Revenue Reserves and Allowances - Disaggregation of Revenue (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Product Revenue Reserves and Allowances - Disaggregation of Revenue (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowancesDisaggregationOfRevenueParentheticalDetail</Role>
      <ShortName>Product Revenue Reserves and Allowances - Disaggregation of Revenue (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Product Revenue Reserves and Allowances - Product Revenue Allowance and Reserves (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowancesProductRevenueAllowanceAndReservesDetail</Role>
      <ShortName>Product Revenue Reserves and Allowances - Product Revenue Allowance and Reserves (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Product Revenue Reserves and Allowances - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureProductRevenueReservesAndAllowancesAdditionalInformationDetail</Role>
      <ShortName>Product Revenue Reserves and Allowances - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Inventory - Schedule of Inventory (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureInventoryScheduleOfInventoryDetail</Role>
      <ShortName>Inventory - Schedule of Inventory (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Intangible Assets - Reconciliation of Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssetsReconciliationOfIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets - Reconciliation of Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Intangible Assets - Schedule of Net Book Value of Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssetsScheduleOfNetBookValueOfIntangibleAssetsDetail</Role>
      <ShortName>Intangible Assets - Schedule of Net Book Value of Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Intangible Assets - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIntangibleAssetsAdditionalInformationDetail</Role>
      <ShortName>Intangible Assets - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentNetScheduleOfPropertyAndEquipmentDetail</Role>
      <ShortName>Property and Equipment, Net - Schedule of Property and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Property and Equipment, Net - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentNetAdditionalInformationDetail</Role>
      <ShortName>Property and Equipment, Net - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Accrued Expenses - Schedule of Accrued Expenses (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureAccruedExpensesScheduleOfAccruedExpensesDetail</Role>
      <ShortName>Accrued Expenses - Schedule of Accrued Expenses (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Leases - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeasesAdditionalInformationDetail</Role>
      <ShortName>Leases - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Leases - Supplemental Balance Sheet Related to Operating Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeasesSupplementalBalanceSheetRelatedToOperatingLeasesDetail</Role>
      <ShortName>Leases - Supplemental Balance Sheet Related to Operating Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Leases - Supplemental Balance Sheet Related to Finance Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeasesSupplementalBalanceSheetRelatedToFinanceLeasesDetail</Role>
      <ShortName>Leases - Supplemental Balance Sheet Related to Finance Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Leases - Future Minimum Lease Payments Under Non-Cancellable Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLeasesFutureMinimumLeasePaymentsUnderNonCancellableLeasesDetail</Role>
      <ShortName>Leases - Future Minimum Lease Payments Under Non-Cancellable Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Loan Agreements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLoanAgreementsAdditionalInformationDetail</Role>
      <ShortName>Loan Agreements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Stockholders' Equity - Equity Financings - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquityEquityFinancingsAdditionalInformationDetail</Role>
      <ShortName>Stockholders' Equity - Equity Financings - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Stockholders' Equity - Summary of Reconciliation of Warrants to Purchase Share of the Company's Common Stock (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquitySummaryOfReconciliationOfWarrantsToPurchaseShareOfCompanySCommonStockDetail</Role>
      <ShortName>Stockholders' Equity - Summary of Reconciliation of Warrants to Purchase Share of the Company's Common Stock (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Stockholders' Equity - Warrants to Purchase Common Shares - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureStockholdersEquityWarrantsToPurchaseCommonSharesAdditionalInformationDetail</Role>
      <ShortName>Stockholders' Equity - Warrants to Purchase Common Shares - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Share-Based Payment Awards - Equity Incentive Plans - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsEquityIncentivePlansAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Equity Incentive Plans - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Share-Based Payment Awards - Stock Option Activity Under Company's Equity Incentive Plan (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsStockOptionActivityUnderCompanySEquityIncentivePlanDetail</Role>
      <ShortName>Share-Based Payment Awards - Stock Option Activity Under Company's Equity Incentive Plan (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Share-Based Payment Awards - Stock Options - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsStockOptionsAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Stock Options - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Share-Based Payment Awards - Summary of Company Applied the Black-Scholes Option Pricing (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsSummaryOfCompanyAppliedBlackScholesOptionPricingDetail</Role>
      <ShortName>Share-Based Payment Awards - Summary of Company Applied the Black-Scholes Option Pricing (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Share-Based Payment Awards - Summary of Information about Stock Options (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsSummaryOfInformationAboutStockOptionsDetail</Role>
      <ShortName>Share-Based Payment Awards - Summary of Information about Stock Options (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Share-Based Payment Awards - Time-Vested Restricted Stock Units - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsTimeVestedRestrictedStockUnitsAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Time-Vested Restricted Stock Units - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Share-Based Payment Awards - Summary of Restricted Stock Unit Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsSummaryOfRestrictedStockUnitActivityDetail</Role>
      <ShortName>Share-Based Payment Awards - Summary of Restricted Stock Unit Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Share-Based Payment Awards - Deferred Stock Units - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsDeferredStockUnitsAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Deferred Stock Units - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Share-Based Payment Awards - Employee Stock Purchase Plan - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsEmployeeStockPurchasePlanAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Employee Stock Purchase Plan - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Share-Based Payment Awards - Compensation Expense from Stock-Based Payment Awards (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsCompensationExpenseFromStockBasedPaymentAwardsDetail</Role>
      <ShortName>Share-Based Payment Awards - Compensation Expense from Stock-Based Payment Awards (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Share-Based Payment Awards - Stock-Based Compensation Expense - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureShareBasedPaymentAwardsStockBasedCompensationExpenseAdditionalInformationDetail</Role>
      <ShortName>Share-Based Payment Awards - Stock-Based Compensation Expense - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100720 - Disclosure - License and Asset Purchase Agreements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureLicenseAndAssetPurchaseAgreementsAdditionalInformationDetail</Role>
      <ShortName>License and Asset Purchase Agreements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureFairValueMeasurementsAssetsAndLiabilitiesCarriedAtFairValueMeasuredOnRecurringBasisDetail</Role>
      <ShortName>Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Fair Value Measurements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetail</Role>
      <ShortName>Fair Value Measurements - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Retirement Plans - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetail</Role>
      <ShortName>Retirement Plans - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Income Taxes - Components of Loss Before Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxesComponentsOfLossBeforeIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Components of Loss Before Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Income Taxes - Difference Between Expected Income Tax Benefit and Actual Income Tax Benefit (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxesDifferenceBetweenExpectedIncomeTaxBenefitAndActualIncomeTaxBenefitDetail</Role>
      <ShortName>Income Taxes - Difference Between Expected Income Tax Benefit and Actual Income Tax Benefit (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Income Taxes - Significant Components of Deferred Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureIncomeTaxesSignificantComponentsOfDeferredIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Significant Components of Deferred Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Segment and Geographic Area Information - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSegmentAndGeographicAreaInformationAdditionalInformationDetail</Role>
      <ShortName>Segment and Geographic Area Information - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Segment and Geographic Area Information - Summary of Company's Revenues and Long-Lived Assets, Net, by Geographic Area (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSegmentAndGeographicAreaInformationSummaryOfCompanySRevenuesAndLongLivedAssetsNetByGeographicAreaDetail</Role>
      <ShortName>Segment and Geographic Area Information - Summary of Company's Revenues and Long-Lived Assets, Net, by Geographic Area (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="eypt-10k_20211231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eyepointpharma.com/20211231/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</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-K" original="eypt-10k_20211231.htm">eypt-10k_20211231.htm</File>
    <File>eypt-20211231.xsd</File>
    <File>eypt-20211231_cal.xml</File>
    <File>eypt-20211231_def.xml</File>
    <File>eypt-20211231_lab.xml</File>
    <File>eypt-20211231_pre.xml</File>
    <File>eypt-ex1019_924.htm</File>
    <File>eypt-ex1028_1698.htm</File>
    <File>eypt-ex1045_1565.htm</File>
    <File>eypt-ex1046_2496.htm</File>
    <File>eypt-ex211_8.htm</File>
    <File>eypt-ex231_9.htm</File>
    <File>eypt-ex311_11.htm</File>
    <File>eypt-ex312_6.htm</File>
    <File>eypt-ex321_7.htm</File>
    <File>eypt-ex322_10.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g0exp3o4wshp000001.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="747">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="37">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
