3.24.1 html 317 337 1 false 71 0 false 13 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Statements of Operations Sheet http://www.nucana.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 2 false false R3.htm 100020 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://www.nucana.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveLoss Consolidated Statements of Comprehensive Loss Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Financial Position Sheet http://www.nucana.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfFinancialPosition Consolidated Statements of Financial Position Statements 4 false false R5.htm 100040 - Statement - Consolidated Statements Of Changes In Equity Sheet http://www.nucana.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfChangesInEquity Consolidated Statements Of Changes In Equity Statements 5 false false R6.htm 100050 - Statement - Consolidated Statements of Cash Flows Sheet http://www.nucana.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 100060 - Disclosure - General Information Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureGeneralInformation1 General Information Notes 7 false false R8.htm 100070 - Disclosure - Material Accounting Policies Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPolicies1 Material Accounting Policies Notes 8 false false R9.htm 100080 - Disclosure - Staff Costs Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCosts Staff Costs Notes 9 false false R10.htm 100090 - Disclosure - Basic and Diluted Loss Per Share Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureBasicAndDilutedLossPerShare Basic and Diluted Loss Per Share Notes 10 false false R11.htm 100100 - Disclosure - Loss Before Tax Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLossBeforeTax Loss Before Tax Notes 11 false false R12.htm 100110 - Disclosure - Capital Commitments and Contingencies Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCapitalCommitmentsAndContingencies Capital Commitments and Contingencies Notes 12 false false R13.htm 100120 - Disclosure - Income Tax Credit Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCredit Income Tax Credit Notes 13 false false R14.htm 100130 - Disclosure - Intangible Assets Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIntangibleAssets Intangible Assets Notes 14 false false R15.htm 100140 - Disclosure - Property Plant and Equipment Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePropertyPlantAndEquipment1 Property Plant and Equipment Notes 15 false false R16.htm 100150 - Disclosure - Other Assets Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureOtherAssets1 Other Assets Notes 16 false false R17.htm 100160 - Disclosure - Prepayments, Accrued Income and Other Receivables Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePrepaymentsAccruedIncomeAndOtherReceivables1 Prepayments, Accrued Income and Other Receivables Notes 17 false false R18.htm 100170 - Disclosure - Share Capital and Share Premium Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremium Share Capital and Share Premium Notes 18 false false R19.htm 100180 - Disclosure - Other Reserves Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureOtherReserves Other Reserves Notes 19 false false R20.htm 100190 - Disclosure - Share-based Payments Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPayments Share-based Payments Notes 20 false false R21.htm 100200 - Disclosure - Leases Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeases Leases Notes 21 false false R22.htm 100210 - Disclosure - Related Party Disclosures Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureRelatedPartyDisclosures Related Party Disclosures Notes 22 false false R23.htm 100220 - Disclosure - Cash and Cash Equivalents Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCashAndCashEquivalents Cash and Cash Equivalents Notes 23 false false R24.htm 100230 - Disclosure - Financial Instruments Risk Management Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagement Financial Instruments Risk Management Notes 24 false false R25.htm 100240 - Disclosure - Provisions Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureProvisions1 Provisions Notes 25 false false R26.htm 100250 - Disclosure - Events After the Reporting Period Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureEventsAfterReportingPeriod Events After the Reporting Period Notes 26 false false R27.htm 100260 - Disclosure - Material Accounting Policies (Policies) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPoliciesPolicies Material Accounting Policies (Policies) Policies http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPolicies1 27 false false R28.htm 100270 - Disclosure - Material Accounting Policies (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPoliciesTables Material Accounting Policies (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPolicies1 28 false false R29.htm 100280 - Disclosure - Staff Costs (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCostsTables Staff Costs (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCosts 29 false false R30.htm 100290 - Disclosure - Basic and Diluted Loss Per Share (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureBasicAndDilutedLossPerShareTables Basic and Diluted Loss Per Share (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureBasicAndDilutedLossPerShare 30 false false R31.htm 100300 - Disclosure - Loss Before Tax (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLossBeforeTaxTables Loss Before Tax (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLossBeforeTax 31 false false R32.htm 100310 - Disclosure - Income Tax Credit (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCreditTables Income Tax Credit (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCredit 32 false false R33.htm 100320 - Disclosure - Intangible Assets (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIntangibleAssets 33 false false R34.htm 100330 - Disclosure - Property Plant and Equipment (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePropertyPlantAndEquipmentTables Property Plant and Equipment (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/DisclosurePropertyPlantAndEquipment1 34 false false R35.htm 100340 - Disclosure - Other Assets (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureOtherAssetsTables Other Assets (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/DisclosureOtherAssets1 35 false false R36.htm 100350 - Disclosure - Prepayments, Accrued Income and Other Receivables (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePrepaymentsAccruedIncomeAndOtherReceivablesTables Prepayments, Accrued Income and Other Receivables (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/DisclosurePrepaymentsAccruedIncomeAndOtherReceivables1 36 false false R37.htm 100360 - Disclosure - Share Capital and Share Premium (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremiumTables Share Capital and Share Premium (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremium 37 false false R38.htm 100370 - Disclosure - Other Reserves (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureOtherReservesTables Other Reserves (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureOtherReserves 38 false false R39.htm 100380 - Disclosure - Share-based Payments (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPaymentsTables Share-based Payments (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPayments 39 false false R40.htm 100390 - Disclosure - Leases (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeases 40 false false R41.htm 100400 - Disclosure - Related Party Disclosures (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureRelatedPartyDisclosuresTables Related Party Disclosures (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureRelatedPartyDisclosures 41 false false R42.htm 100410 - Disclosure - Cash and Cash Equivalents (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCashAndCashEquivalentsTables Cash and Cash Equivalents (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCashAndCashEquivalents 42 false false R43.htm 100420 - Disclosure - Financial Instruments Risk Management (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagementTables Financial Instruments Risk Management (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagement 43 false false R44.htm 100430 - Disclosure - Provisions (Tables) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureProvisionsTables Provisions (Tables) Tables http://www.nucana.com/20231231/taxonomy/role/DisclosureProvisions1 44 false false R45.htm 100440 - Disclosure - General Information- Additional Information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureGeneralInformationAdditionalInformationDetail General Information- Additional Information (Detail) Details 45 false false R46.htm 100450 - Disclosure - Material Accounting Policies - Additional Information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPoliciesAdditionalInformationDetail Material Accounting Policies - Additional Information (Detail) Details 46 false false R47.htm 100460 - Disclosure - Material Accounting Policies - Summary of Depreciation on Property, Plant and Equipment Over Their Expected Useful Economic Life (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPoliciesSummaryOfDepreciationOnPropertyPlantAndEquipmentOverTheirExpectedUsefulEconomicLifeDetail Material Accounting Policies - Summary of Depreciation on Property, Plant and Equipment Over Their Expected Useful Economic Life (Detail) Details 47 false false R48.htm 100470 - Disclosure - Material Accounting Policies - Summery of Amortization Method and Amortization Period for the Principal Categories of Intangible Assets (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureMaterialAccountingPoliciesSummeryOfAmortizationMethodAndAmortizationPeriodForThePrincipalCategoriesOfIntangibleAssetsDetail Material Accounting Policies - Summery of Amortization Method and Amortization Period for the Principal Categories of Intangible Assets (Detail) Details 48 false false R49.htm 100480 - Disclosure - Staff Costs - Disclosure of Employee Benefit Expense (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCostsDisclosureOfEmployeeBenefitExpenseDetails Staff Costs - Disclosure of Employee Benefit Expense (Details) Details 49 false false R50.htm 100490 - Disclosure - Staff Costs - Schedule of Average Number of Staff Employed Under Contracts of Service Explanatory (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCostsScheduleOfAverageNumberOfStaffEmployedUnderContractsOfServiceExplanatoryDetails Staff Costs - Schedule of Average Number of Staff Employed Under Contracts of Service Explanatory (Details) Details 50 false false R51.htm 100500 - Disclosure - Staff Costs - Summary of Directors' Remuneration and Other Benefits (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureStaffCostsSummaryOfDirectorsRemunerationAndOtherBenefitsDetails Staff Costs - Summary of Directors' Remuneration and Other Benefits (Details) Details 51 false false R52.htm 100510 - Disclosure - Staff Costs - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureStaffCostsAdditionalInformationDetails Staff Costs - Additional Information (Details) Details 52 false false R53.htm 100520 - Disclosure - Basic and Diluted Loss Per Share - Schedule of Basic and Diluted Loss Per Share (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureBasicAndDilutedLossPerShareScheduleOfBasicAndDilutedLossPerShareDetail Basic and Diluted Loss Per Share - Schedule of Basic and Diluted Loss Per Share (Detail) Details 53 false false R54.htm 100530 - Disclosure - Loss Before Tax - Summary of Loss Before Tax Stated After Charging (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLossBeforeTaxSummaryOfLossBeforeTaxStatedAfterChargingDetail Loss Before Tax - Summary of Loss Before Tax Stated After Charging (Detail) Details 54 false false R55.htm 100540 - Disclosure - Capital Commitments and Contingencies - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCapitalCommitmentsAndContingenciesAdditionalInformationDetails Capital Commitments and Contingencies - Additional Information (Details) Details 55 false false R56.htm 100550 - Disclosure - Income Tax Credit - Schedule of Major Components of Income Tax (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCreditScheduleOfMajorComponentsOfIncomeTaxDetails Income Tax Credit - Schedule of Major Components of Income Tax (Details) Details 56 false false R57.htm 100560 - Disclosure - Income Tax Credit - Schedule of Reconciliation of Accounting Loss per Statement of Operations (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCreditScheduleOfReconciliationOfAccountingLossPerStatementOfOperationsDetails Income Tax Credit - Schedule of Reconciliation of Accounting Loss per Statement of Operations (Details) Details 57 false false R58.htm 100570 - Disclosure - Income Tax Credit - Schedule of Reconciliation of Accounting Loss per Statement of Operations (Parenthetical) (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCreditScheduleOfReconciliationOfAccountingLossPerStatementOfOperationsParentheticalDetails Income Tax Credit - Schedule of Reconciliation of Accounting Loss per Statement of Operations (Parenthetical) (Details) Details 58 false false R59.htm 100580 - Disclosure - Income Tax Credit - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIncomeTaxCreditAdditionalInformationDetails Income Tax Credit - Additional Information (Details) Details 59 false false R60.htm 100590 - Disclosure - Intangible Assets - Summary of Intangible Assets (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIntangibleAssetsSummaryOfIntangibleAssetsDetail Intangible Assets - Summary of Intangible Assets (Detail) Details 60 false false R61.htm 100600 - Disclosure - Intangible Assets - Additional Information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureIntangibleAssetsAdditionalInformationDetail Intangible Assets - Additional Information (Detail) Details 61 false false R62.htm 100610 - Disclosure - Property Plant and Equipment - Summary of Property, Plant and Equipment (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetails Property Plant and Equipment - Summary of Property, Plant and Equipment (Details) Details 62 false false R63.htm 100620 - Disclosure - Other Assets - Disclosure of Other Assets (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureOtherAssetsDisclosureOfOtherAssetsDetails Other Assets - Disclosure of Other Assets (Details) Details 63 false false R64.htm 100630 - Disclosure - Other Assets - Additional Information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureOtherAssetsAdditionalInformationDetail Other Assets - Additional Information (Detail) Details 64 false false R65.htm 100640 - Disclosure - Prepayments, Accrued Income and Other Receivables - Summary of Prepayments, Accrued Income and Other Receivables Explanatory (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosurePrepaymentsAccruedIncomeAndOtherReceivablesSummaryOfPrepaymentsAccruedIncomeAndOtherReceivablesExplanatoryDetail Prepayments, Accrued Income and Other Receivables - Summary of Prepayments, Accrued Income and Other Receivables Explanatory (Detail) Details 65 false false R66.htm 100650 - Disclosure - Share Capital and Share Premium - Summary of Share Capital and Share Premium (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremiumSummaryOfShareCapitalAndSharePremiumDetail Share Capital and Share Premium - Summary of Share Capital and Share Premium (Detail) Details 66 false false R67.htm 100660 - Disclosure - Share Capital and Share Premium - Summary of Share Capital and Share Premium (Parenthetical) (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremiumSummaryOfShareCapitalAndSharePremiumParentheticalDetail Share Capital and Share Premium - Summary of Share Capital and Share Premium (Parenthetical) (Detail) Details 67 false false R68.htm 100670 - Disclosure - Share Capital and Share Premium - Summary of Movement in the Share Capital (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareCapitalAndSharePremiumSummaryOfMovementInShareCapitalDetail Share Capital and Share Premium - Summary of Movement in the Share Capital (Detail) Details 68 false false R69.htm 100680 - Disclosure - Other Reserves - Schedule of Other Reserves (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureOtherReservesScheduleOfOtherReservesDetail Other Reserves - Schedule of Other Reserves (Detail) Details 69 false false R70.htm 100690 - Disclosure - Other Reserves - Additional Information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureOtherReservesAdditionalInformationDetail Other Reserves - Additional Information (Detail) Details 70 false false R71.htm 100700 - Disclosure - Share-based Payments - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPaymentsAdditionalInformationDetails Share-based Payments - Additional Information (Details) Details 71 false false R72.htm 100710 - Disclosure - Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPaymentsSummaryOfShareOptionsAndWeightedAverageExercisePricesDetails Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Details) Details 72 false false R73.htm 100720 - Disclosure - Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Parenthetical) (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPaymentsSummaryOfShareOptionsAndWeightedAverageExercisePricesParentheticalDetails Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Parenthetical) (Details) Details 73 false false R74.htm 100730 - Disclosure - Share-based Payments - Summary of Principal Assumptions used for Valuation of Share Options (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureShareBasedPaymentsSummaryOfPrincipalAssumptionsUsedForValuationOfShareOptionsDetails Share-based Payments - Summary of Principal Assumptions used for Valuation of Share Options (Details) Details 74 false false R75.htm 100740 - Disclosure - Leases - Additional information (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetail Leases - Additional information (Detail) Details 75 false false R76.htm 100750 - Disclosure - Leases - Summary of Carrying Amounts of Lease Liabilities (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfCarryingAmountsOfLeaseLiabilitiesDetail Leases - Summary of Carrying Amounts of Lease Liabilities (Detail) Details 76 false false R77.htm 100760 - Disclosure - Leases - Summary of Maturity Analysis of Lease Liabilities (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfMaturityAnalysisOfLeaseLiabilitiesDetail Leases - Summary of Maturity Analysis of Lease Liabilities (Detail) Details 77 false false R78.htm 100770 - Disclosure - Leases - Summary of Amounts Recognized in Statements of Operations With Respect to Lease Contracts (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfAmountsRecognizedInStatementsOfOperationsWithRespectToLeaseContractsDetail Leases - Summary of Amounts Recognized in Statements of Operations With Respect to Lease Contracts (Detail) Details 78 false false R79.htm 100780 - Disclosure - Leases - Summary of Maturity Analysis of Lease Liabilities Extension Options Not Expected to be Exercised (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureLeasesSummaryOfMaturityAnalysisOfLeaseLiabilitiesExtensionOptionsNotExpectedToBeExercisedDetail Leases - Summary of Maturity Analysis of Lease Liabilities Extension Options Not Expected to be Exercised (Detail) Details 79 false false R80.htm 100790 - Disclosure - Related Party Disclosures - Summary of Compensation of Key Management Personnel (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureRelatedPartyDisclosuresSummaryOfCompensationOfKeyManagementPersonnelDetail Related Party Disclosures - Summary of Compensation of Key Management Personnel (Detail) Details 80 false false R81.htm 100800 - Disclosure - Cash and Cash Equivalents - Schedule of Detailed Information About Cash and Cash Equivalents (Detail) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureCashAndCashEquivalentsScheduleOfDetailedInformationAboutCashAndCashEquivalentsDetail Cash and Cash Equivalents - Schedule of Detailed Information About Cash and Cash Equivalents (Detail) Details 81 false false R82.htm 100810 - Disclosure - Financial Instruments Risk Management - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagementAdditionalInformationDetails Financial Instruments Risk Management - Additional Information (Details) Details 82 false false R83.htm 100820 - Disclosure - Financial Instruments Risk Management - Schedule of Financial Assets Subject to Fixed or Variable Interest Rates (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagementScheduleOfFinancialAssetsSubjectToFixedOrVariableInterestRatesDetails Financial Instruments Risk Management - Schedule of Financial Assets Subject to Fixed or Variable Interest Rates (Details) Details 83 false false R84.htm 100830 - Disclosure - Financial Instruments Risk Management - Summary of Financial Assets and Liabilities in Foreign Currencies, Primarily Held in U.S Dollars (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/Role_DisclosureFinancialInstrumentsRiskManagementSummaryOfFinancialAssetsAndLiabilitiesInForeignCurrenciesPrimarilyHeldInUSDollarsDetails Financial Instruments Risk Management - Summary of Financial Assets and Liabilities in Foreign Currencies, Primarily Held in U.S Dollars (Details) Details 84 false false R85.htm 100840 - Disclosure - Provisions - Summary of Provisions (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureProvisionsSummaryOfProvisionsDetails Provisions - Summary of Provisions (Details) Details 85 false false R86.htm 100850 - Disclosure - Provisions - Additional Information (Details) Sheet http://www.nucana.com/20231231/taxonomy/role/DisclosureProvisionsAdditionalInformationDetails Provisions - Additional Information (Details) Details 86 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 1 fact(s) appearing in ix:hidden were eligible for transformation: ifrs-full:UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment - ncna-20231231.htm 8 ncna-20231231.htm ncna-20231231.xsd img226350019_0.jpg img226350019_1.jpg img226350019_10.jpg img226350019_11.jpg img226350019_12.jpg img226350019_2.jpg img226350019_3.jpg img226350019_4.jpg img226350019_5.jpg img226350019_6.jpg img226350019_7.jpg img226350019_8.jpg img226350019_9.jpg http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 https://xbrl.ifrs.org/taxonomy/2023-03-23/ifrs-full false false