<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>281</ContextCount>
  <ElementCount>562</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>101</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>16</UnitCount>
  <MyReports>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200105 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200200 - Statement - Consolidated Statements of Operations and Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/StatementConsolidatedStatementsOfOperationsAndComprehensiveLoss</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200300 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/StatementConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200400 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - DESCRIPTION OF BUSINESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusiness</Role>
      <ShortName>DESCRIPTION OF BUSINESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestments</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInventories</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeases</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - PROPERTY, PLANT AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssets</Role>
      <ShortName>INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210801 - Disclosure - ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureAccruedAndOtherCurrentLiabilitiesAndOtherLiabilities</Role>
      <ShortName>ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210901 - Disclosure - SHORT TERM BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShortTermBorrowings</Role>
      <ShortName>SHORT TERM BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995211001 - Disclosure - GRANTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureGrants</Role>
      <ShortName>GRANTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995211101 - Disclosure - REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowing</Role>
      <ShortName>REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995211201 - Disclosure - SHAREHOLDERS' (DEFICIT) EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareholdersDeficitEquity</Role>
      <ShortName>SHAREHOLDERS' (DEFICIT) EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995211301 - Disclosure - NET LOSS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureNetLossPerShare</Role>
      <ShortName>NET LOSS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995211401 - Disclosure - EMPLOYEE BENEFIT PLAN</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureEmployeeBenefitPlan</Role>
      <ShortName>EMPLOYEE BENEFIT PLAN</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995211501 - Disclosure - SHARE-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensation</Role>
      <ShortName>SHARE-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995211601 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995211701 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureFairValueMeasurements</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995211801 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995211901 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995212001 - Disclosure - RESTRICTED NET ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRestrictedNetAssets</Role>
      <ShortName>RESTRICTED NET ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995212101 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995212201 - Disclosure - CONDENSED FINANCIAL INFORMATION OF REGISTRANT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrant</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF REGISTRANT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.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>29</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>99920202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>99930303 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsTables</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestments</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInventoriesTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureInventories</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>99930503 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeasesTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureLeases</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssetsTables</Role>
      <ShortName>INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureIntangibleAssets</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>99930803 - Disclosure - ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureAccruedAndOtherCurrentLiabilitiesAndOtherLiabilitiesTables</Role>
      <ShortName>ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureAccruedAndOtherCurrentLiabilitiesAndOtherLiabilities</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>99931103 - Disclosure - REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowingTables</Role>
      <ShortName>REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowing</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>99931203 - Disclosure - SHAREHOLDERS' (DEFICIT) EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareholdersDeficitEquityTables</Role>
      <ShortName>SHAREHOLDERS' (DEFICIT) EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShareholdersDeficitEquity</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>99931303 - Disclosure - NET LOSS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureNetLossPerShareTables</Role>
      <ShortName>NET LOSS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureNetLossPerShare</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>99931503 - Disclosure - SHARE-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationTables</Role>
      <ShortName>SHARE-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShareBasedCompensation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>99931603 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureIncomeTaxes</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>99931703 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureFairValueMeasurements</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>99932203 - Disclosure - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrantTables</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrant</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>99940101 - Disclosure - DESCRIPTION OF BUSINESS - Liquidity and Capital Resources (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLiquidityAndCapitalResourcesDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - Liquidity and Capital Resources (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>99940102 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (China Resources Pharmaceutical Commercial Group International Trading Co., Ltd.) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsChinaResourcesPharmaceuticalCommercialGroupInternationalTradingCoLtdDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (China Resources Pharmaceutical Commercial Group International Trading Co., Ltd.) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>99940103 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Guangzhou Gloria Biosciences Co., Ltd.) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsGuangzhouGloriaBiosciencesCoLtdDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Guangzhou Gloria Biosciences Co., Ltd.) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>99940104 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Precision Autoimmune Therapeutics Co., Ltd) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsPrecisionAutoimmuneTherapeuticsCoLtdDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Precision Autoimmune Therapeutics Co., Ltd) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>99940105 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Juventas Cell Therapy Ltd.) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsJuventasCellTherapyLtdDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Juventas Cell Therapy Ltd.) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>99940106 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (BioInvent International AB) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsBioinventInternationalAbDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (BioInvent International AB) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>99940107 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Black Belt Therapeutics Limited) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsBlackBeltTherapeuticsLimitedDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Black Belt Therapeutics Limited) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>99940108 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Cleave Therapeutics, Inc.) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsCleaveTherapeuticsIncDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Cleave Therapeutics, Inc.) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>99940109 - Disclosure - DESCRIPTION OF BUSINESS - License and Distribution Agreements (Pharmathen Global BV) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureDescriptionOfBusinessLicenseAndDistributionAgreementsPharmathenGlobalBvDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS - License and Distribution Agreements (Pharmathen Global BV) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>99940201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesSegmentReportingDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment Reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>99940202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations Risks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesConcentrationsRisksDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations Risks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>99940203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>99940204 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Prepaid expenses and other (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPrepaidExpensesAndOtherDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Prepaid expenses and other (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>99940205 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PPE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPpeDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PPE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>99940301 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-BioInvent International AB ordinary shares and warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsInvestmentInEquitySecuritiesAtFairValueBioinventInternationalAbOrdinarySharesAndWarrantsDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-BioInvent International AB ordinary shares and warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>99940302 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - BioInvent International AB - Summary of Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsBioinventInternationalAbSummaryOfInvestmentsDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - BioInvent International AB - Summary of Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>99940303 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Summary of Long-term investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsSummaryOfLongTermInvestmentsDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Summary of Long-term investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>99940304 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-Alesta Therapeutics B.V. (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsInvestmentInEquitySecuritiesAtFairValueAlestaTherapeuticsBvDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-Alesta Therapeutics B.V. (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>99940305 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-Cleave Therapeutics, Inc. (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsInvestmentInEquitySecuritiesAtFairValueCleaveTherapeuticsIncDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in equity securities, at fair value-Cleave Therapeutics, Inc. (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>99940306 - Disclosure - INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in Precision Autoimmune Therapeutics Co Ltd (PAT) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInvestmentInEquitySecuritiesAtFairValueAndLongTermInvestmentsInvestmentInPrecisionAutoimmuneTherapeuticsCoLtdPatDetails</Role>
      <ShortName>INVESTMENT IN EQUITY SECURITIES, AT FAIR VALUE AND LONG-TERM INVESTMENTS - Investment in Precision Autoimmune Therapeutics Co Ltd (PAT) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - INVENTORIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInventoriesDetails</Role>
      <ShortName>INVENTORIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureInventoriesTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>99940402 - Disclosure - INVENTORIES - Schedule of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureInventoriesScheduleOfInventoryDetails</Role>
      <ShortName>INVENTORIES - Schedule of Inventory (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>99940501 - Disclosure - LEASES - (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeasesDetails</Role>
      <ShortName>LEASES - (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>99940502 - Disclosure - LEASES - Right of Use Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeasesRightOfUseAssetsAndLiabilitiesDetails</Role>
      <ShortName>LEASES - Right of Use Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>99940503 - Disclosure - LEASES - Supplemental Cash Flow (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeasesSupplementalCashFlowDetails</Role>
      <ShortName>LEASES - Supplemental Cash Flow (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>99940504 - Disclosure - LEASES - Future Undiscounted Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureLeasesFutureUndiscountedCashFlowsDetails</Role>
      <ShortName>LEASES - Future Undiscounted Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Narratives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosurePropertyPlantAndEquipmentNarrativesDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT - Narratives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - By type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosurePropertyPlantAndEquipmentByTypeDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT - By type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - INTANGIBLE ASSETS - Narratives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssetsNarrativesDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Narratives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - INTANGIBLE ASSETS - Net Definite-lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssetsNetDefiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Net Definite-lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>99940703 - Disclosure - INTANGIBLE ASSETS - Intangible Assets Rollforward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssetsIntangibleAssetsRollforwardDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Intangible Assets Rollforward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>99940704 - Disclosure - INTANGIBLE ASSETS - Expected Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIntangibleAssetsExpectedFutureAmortizationExpenseDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Expected Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>99940801 - Disclosure - ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureAccruedAndOtherCurrentLiabilitiesAndOtherLiabilitiesDetails</Role>
      <ShortName>ACCRUED AND OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureAccruedAndOtherCurrentLiabilitiesAndOtherLiabilitiesTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>99940901 - Disclosure - SHORT TERM BORROWINGS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShortTermBorrowingsDetails</Role>
      <ShortName>SHORT TERM BORROWINGS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShortTermBorrowings</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>99941001 - Disclosure - GRANTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureGrantsDetails</Role>
      <ShortName>GRANTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureGrants</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>99941101 - Disclosure - REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowingDetails</Role>
      <ShortName>REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowingTables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>99941102 - Disclosure - REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING - Changes in Redeemable Noncontrolling Interest (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRedeemableNoncontrollingInterestAndLongTermBorrowingChangesInRedeemableNoncontrollingInterestDetails</Role>
      <ShortName>REDEEMABLE NONCONTROLLING INTEREST AND A LONG TERM BORROWING - Changes in Redeemable Noncontrolling Interest (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>99941201 - Disclosure - SHAREHOLDERS' (DEFICIT) EQUITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareholdersDeficitEquityDetails</Role>
      <ShortName>SHAREHOLDERS' (DEFICIT) EQUITY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShareholdersDeficitEquityTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>99941202 - Disclosure - SHAREHOLDERS' (DEFICIT) EQUITY - Warrants Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareholdersDeficitEquityWarrantsActivityDetails</Role>
      <ShortName>SHAREHOLDERS' (DEFICIT) EQUITY - Warrants Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShareholdersDeficitEquityTables</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>99941301 - Disclosure - NET LOSS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureNetLossPerShareDetails</Role>
      <ShortName>NET LOSS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureNetLossPerShareTables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>99941302 - Disclosure - NET LOSS PER SHARE - Basic and diluted net loss per share computation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureNetLossPerShareBasicAndDilutedNetLossPerShareComputationDetails</Role>
      <ShortName>NET LOSS PER SHARE - Basic and diluted net loss per share computation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>99941401 - Disclosure - EMPLOYEE BENEFIT PLAN (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureEmployeeBenefitPlanDetails</Role>
      <ShortName>EMPLOYEE BENEFIT PLAN (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureEmployeeBenefitPlan</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>99941501 - Disclosure - SHARE-BASED COMPENSATION - Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationCompensationExpenseDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>99941502 - Disclosure - SHARE-BASED COMPENSATION - Weighted-Average Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationWeightedAverageAssumptionsDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Weighted-Average Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>99941503 - Disclosure - SHARE-BASED COMPENSATION - Options Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationOptionsOutstandingDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Options Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>99941504 - Disclosure - SHARE-BASED COMPENSATION - Stock Option Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationStockOptionOutstandingDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Stock Option Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>99941505 - Disclosure - SHARE-BASED COMPENSATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureShareBasedCompensationDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureShareBasedCompensationTables</ParentRole>
      <Position>92</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>99941601 - Disclosure - INCOME TAXES - Loss Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesLossBeforeIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - Loss Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>99941602 - Disclosure - INCOME TAXES - Deferred Income Tax Assets And Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesDeferredIncomeTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Deferred Income Tax Assets And Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>99941603 - Disclosure - INCOME TAXES - Reconciliation of income tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesReconciliationOfIncomeTaxDetails</Role>
      <ShortName>INCOME TAXES - Reconciliation of income tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>99941604 - Disclosure - INCOME TAXES - Valuation allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesValuationAllowanceDetails</Role>
      <ShortName>INCOME TAXES - Valuation allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>99941605 - Disclosure - INCOME TAXES - Gross Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesGrossUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>INCOME TAXES - Gross Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>99941606 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureIncomeTaxesTables</ParentRole>
      <Position>98</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>99941701 - Disclosure - FAIR VALUE MEASUREMENTS - Financial and Non-Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureFairValueMeasurementsFinancialAndNonFinancialAssetsAndLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Financial and Non-Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>99941702 - Disclosure - FAIR VALUE MEASUREMENTS - Quantitative Information about Level 3 Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureFairValueMeasurementsQuantitativeInformationAboutLevel3FairValueMeasurementsDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Quantitative Information about Level 3 Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>99941703 - Disclosure - FAIR VALUE MEASUREMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureFairValueMeasurementsDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureFairValueMeasurementsTables</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>99941801 - Disclosure - RELATED PARTY TRANSACTIONS - Convertible Note Financing (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRelatedPartyTransactionsConvertibleNoteFinancingDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Convertible Note Financing (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>99941802 - Disclosure - RELATED PARTY TRANSACTIONS - Purchase of Ordinary Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRelatedPartyTransactionsPurchaseOfOrdinarySharesDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Purchase of Ordinary Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>99941803 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRelatedPartyTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>99941901 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>105</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>99942001 - Disclosure - RESTRICTED NET ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureRestrictedNetAssetsDetails</Role>
      <ShortName>RESTRICTED NET ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureRestrictedNetAssets</ParentRole>
      <Position>106</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>99942101 - Disclosure - SUBSEQUENT EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureSubsequentEventsDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.entremed.com/role/DisclosureSubsequentEvents</ParentRole>
      <Position>107</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>99942201 - Disclosure - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrantCondensedBalanceSheetsDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>99942202 - Disclosure - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Statements of Operations and Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrantCondensedStatementsOfOperationsAndComprehensiveLossDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Statements of Operations and Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="casif-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>99942203 - Disclosure - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.entremed.com/role/DisclosureCondensedFinancialInformationOfRegistrantCondensedStatementsOfCashFlowsDetails</Role>
      <ShortName>CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Condensed Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>casif-20251231.xsd</File>
    <File>casif-20251231_cal.xml</File>
    <File>casif-20251231_def.xml</File>
    <File>casif-20251231_lab.xml</File>
    <File>casif-20251231_pre.xml</File>
    <File doctype="20-F" isDefinitelyFs="true" isUsgaap="true" original="casif-20251231x20f.htm">casif-20251231x20f.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>casif-20251231x20f009.jpg</File>
    <File>casif-20251231x20f010.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="5">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="1091">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="45">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
