3.25.3 html 192 263 1 false 54 0 false 5 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://adherex.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - Condensed Consolidated Balance Sheets Sheet http://adherex.com/role/StatementCondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 995200105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://adherex.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - Condensed Consolidated Statements of Operations Sheet http://adherex.com/role/StatementCondensedConsolidatedStatementsOfOperations Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 995200300 - Statement - Condensed Consolidated Statements of Stockholders' Equity Sheet http://adherex.com/role/StatementCondensedConsolidatedStatementsOfStockholdersEquity Condensed Consolidated Statements of Stockholders' Equity Statements 5 false false R6.htm 995200400 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://adherex.com/role/StatementCondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 995210101 - Disclosure - Nature of Business and Liquidity Sheet http://adherex.com/role/DisclosureNatureOfBusinessAndLiquidity Nature of Business and Liquidity Notes 7 false false R8.htm 995210201 - Disclosure - Significant Accounting Policies Sheet http://adherex.com/role/DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 8 false false R9.htm 995210301 - Disclosure - Loss per Share Sheet http://adherex.com/role/DisclosureLossPerShare Loss per Share Notes 9 false false R10.htm 995210401 - Disclosure - Stockholders' Equity Sheet http://adherex.com/role/DisclosureStockholdersEquity Stockholders' Equity Notes 10 false false R11.htm 995210501 - Disclosure - Fair Value Measurements Sheet http://adherex.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 11 false false R12.htm 995210601 - Disclosure - Commitments and Contingencies Sheet http://adherex.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 12 false false R13.htm 995210701 - Disclosure - Term Loans Sheet http://adherex.com/role/DisclosureTermLoans Term Loans Notes 13 false false R14.htm 995210801 - Disclosure - License Agreement Sheet http://adherex.com/role/DisclosureLicenseAgreement License Agreement Notes 14 false false R15.htm 995210901 - Disclosure - Segment Reporting Sheet http://adherex.com/role/DisclosureSegmentReporting Segment Reporting Notes 15 false false R16.htm 995211001 - Disclosure - Subsequent Events Sheet http://adherex.com/role/DisclosureSubsequentEvents Subsequent Events Notes 16 false false R17.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 17 false false R18.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 18 false false R19.htm 99920202 - Disclosure - Significant Accounting Policies (Policies) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://adherex.com/role/DisclosureSignificantAccountingPolicies 19 false false R20.htm 99930203 - Disclosure - Significant Accounting Policies (Tables) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesTables Significant Accounting Policies (Tables) Tables http://adherex.com/role/DisclosureSignificantAccountingPolicies 20 false false R21.htm 99930303 - Disclosure - Loss per Share (Tables) Sheet http://adherex.com/role/DisclosureLossPerShareTables Loss per Share (Tables) Tables http://adherex.com/role/DisclosureLossPerShare 21 false false R22.htm 99930403 - Disclosure - Stockholders' Equity (Tables) Sheet http://adherex.com/role/DisclosureStockholdersEquityTables Stockholders' Equity (Tables) Tables http://adherex.com/role/DisclosureStockholdersEquity 22 false false R23.htm 99930503 - Disclosure - Fair Value Measurements (Tables) Sheet http://adherex.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://adherex.com/role/DisclosureFairValueMeasurements 23 false false R24.htm 99930803 - Disclosure - Term Loans (Tables) Sheet http://adherex.com/role/DisclosureTermLoansTables Term Loans (Tables) Tables http://adherex.com/role/DisclosureTermLoans 24 false false R25.htm 99940101 - Disclosure - Nature of Business and Liquidity (Details) Sheet http://adherex.com/role/DisclosureNatureOfBusinessAndLiquidityDetails Nature of Business and Liquidity (Details) Details http://adherex.com/role/DisclosureNatureOfBusinessAndLiquidity 25 false false R26.htm 99940201 - Disclosure - Significant Accounting Policies - Narrative (Details) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesNarrativeDetails Significant Accounting Policies - Narrative (Details) Details 26 false false R27.htm 99940202 - Disclosure - Significant Accounting Policies - Product Sales Discounts and Allowances (Details) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesProductSalesDiscountsAndAllowancesDetails Significant Accounting Policies - Product Sales Discounts and Allowances (Details) Details 27 false false R28.htm 99940203 - Disclosure - Significant Accounting Policies - Product Sales Discounts and Allowances Continued (Details) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesProductSalesDiscountsAndAllowancesContinuedDetails Significant Accounting Policies - Product Sales Discounts and Allowances Continued (Details) Details 28 false false R29.htm 99940204 - Disclosure - Significant Accounting Policies - Cost of Products Sold (Details) Sheet http://adherex.com/role/DisclosureSignificantAccountingPoliciesCostOfProductsSoldDetails Significant Accounting Policies - Cost of Products Sold (Details) Details 29 false false R30.htm 99940301 - Disclosure - Loss per Share - Computation of Basic and Diluted (Details) Sheet http://adherex.com/role/DisclosureLossPerShareComputationOfBasicAndDilutedDetails Loss per Share - Computation of Basic and Diluted (Details) Details 30 false false R31.htm 99940302 - Disclosure - Loss per Share - Outstanding Options and Warrants (Details) Sheet http://adherex.com/role/DisclosureLossPerShareOutstandingOptionsAndWarrantsDetails Loss per Share - Outstanding Options and Warrants (Details) Details 31 false false R32.htm 99940401 - Disclosure - Stockholders' Equity - Narrative (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityNarrativeDetails Stockholders' Equity - Narrative (Details) Details 32 false false R33.htm 99940402 - Disclosure - Stockholders' Equity - Warrants to Purchase Common Stock (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityWarrantsToPurchaseCommonStockDetails Stockholders' Equity - Warrants to Purchase Common Stock (Details) Details 33 false false R34.htm 99940403 - Disclosure - Stockholders' Equity - Recognized Contractor and Employee Expense (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityRecognizedContractorAndEmployeeExpenseDetails Stockholders' Equity - Recognized Contractor and Employee Expense (Details) Details 34 false false R35.htm 99940404 - Disclosure - Stockholders' Equity - Summary of Option Activity (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquitySummaryOfOptionActivityDetails Stockholders' Equity - Summary of Option Activity (Details) Details 35 false false R36.htm 99940405 - Disclosure - Stockholders' Equity - Black Scholes Option Pricing Model (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityBlackScholesOptionPricingModelDetails Stockholders' Equity - Black Scholes Option Pricing Model (Details) Details 36 false false R37.htm 99940406 - Disclosure - Stockholders' Equity - Performance Share Activity (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityPerformanceShareActivityDetails Stockholders' Equity - Performance Share Activity (Details) Details 37 false false R38.htm 99940407 - Disclosure - Stockholders Equity - Restricted Share Units Activity (Details) Sheet http://adherex.com/role/DisclosureStockholdersEquityRestrictedShareUnitsActivityDetails Stockholders Equity - Restricted Share Units Activity (Details) Details 38 false false R39.htm 99940501 - Disclosure - Fair Value Measurements - Assets/Liabilities Measured at Fair Value (Details) Sheet http://adherex.com/role/DisclosureFairValueMeasurementsAssetsLiabilitiesMeasuredAtFairValueDetails Fair Value Measurements - Assets/Liabilities Measured at Fair Value (Details) Details 39 false false R40.htm 99940502 - Disclosure - Fair Value Measurements - Additional Information (Details) Sheet http://adherex.com/role/DisclosureFairValueMeasurementsAdditionalInformationDetails Fair Value Measurements - Additional Information (Details) Details 40 false false R41.htm 99940601 - Disclosure - Commitments and Contingencies (Details) Sheet http://adherex.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://adherex.com/role/DisclosureCommitmentsAndContingencies 41 false false R42.htm 99940701 - Disclosure - Term Loans (Details) Sheet http://adherex.com/role/DisclosureTermLoansDetails Term Loans (Details) Details http://adherex.com/role/DisclosureTermLoansTables 42 false false R43.htm 99940702 - Disclosure - Term Loans - Aggregate annual payments due on Term Loan (Details) Sheet http://adherex.com/role/DisclosureTermLoansAggregateAnnualPaymentsDueOnTermLoanDetails Term Loans - Aggregate annual payments due on Term Loan (Details) Details 43 false false R44.htm 99940801 - Disclosure - License Agreement (Details) Sheet http://adherex.com/role/DisclosureLicenseAgreementDetails License Agreement (Details) Details http://adherex.com/role/DisclosureLicenseAgreement 44 false false R45.htm 99940901 - Disclosure - Segment Reporting (Details) Sheet http://adherex.com/role/DisclosureSegmentReportingDetails Segment Reporting (Details) Details http://adherex.com/role/DisclosureSegmentReporting 45 false false All Reports Book All Reports fencf-20250930.xsd fencf-20250930_cal.xml fencf-20250930_def.xml fencf-20250930_lab.xml fencf-20250930_pre.xml fencf-20250930x10q.htm http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true