3.26.1 html 1146 725 1 false 285 0 false 21 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.sequans.com/role/CoverPage Cover Page Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.sequans.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - Consolidated Statements of Operations Sheet http://www.sequans.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 3 false false R4.htm 9952152 - Statement - Consolidated Statements of Comprehensive Income (Loss) Statement Sheet http://www.sequans.com/role/ConsolidatedStatementsofComprehensiveIncomeLossStatement Consolidated Statements of Comprehensive Income (Loss) Statement Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements of Financial Position Sheet http://www.sequans.com/role/ConsolidatedStatementsofFinancialPosition Consolidated Statements of Financial Position Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statements of Financial Position (Parenthetical) Sheet http://www.sequans.com/role/ConsolidatedStatementsofFinancialPositionParenthetical Consolidated Statements of Financial Position (Parenthetical) Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statements of Changes in Equity (Deficit) Statement Sheet http://www.sequans.com/role/ConsolidatedStatementsofChangesinEquityDeficitStatement Consolidated Statements of Changes in Equity (Deficit) Statement Statements 7 false false R8.htm 9952156 - Statement - Statements of Cash Flow Sheet http://www.sequans.com/role/StatementsofCashFlow Statements of Cash Flow Statements 8 false false R9.htm 9952157 - Disclosure - Corporate information Sheet http://www.sequans.com/role/Corporateinformation Corporate information Notes 9 false false R10.htm 9952158 - Disclosure - Summary of significant accounting and reporting policies Sheet http://www.sequans.com/role/Summaryofsignificantaccountingandreportingpolicies Summary of significant accounting and reporting policies Notes 10 false false R11.htm 9952159 - Disclosure - Acquisition of ACP Advanced Circuit Pursuit AG Sheet http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAG Acquisition of ACP Advanced Circuit Pursuit AG Notes 11 false false R12.htm 9952160 - Disclosure - 4G technology sale to Qualcomm and related agreements Sheet http://www.sequans.com/role/A4GtechnologysaletoQualcommandrelatedagreements 4G technology sale to Qualcomm and related agreements Notes 12 false false R13.htm 9952161 - Disclosure - Segment information Sheet http://www.sequans.com/role/Segmentinformation Segment information Notes 13 false false R14.htm 9952162 - Disclosure - Other revenues and expenses Sheet http://www.sequans.com/role/Otherrevenuesandexpenses Other revenues and expenses Notes 14 false false R15.htm 9952163 - Disclosure - Income tax Sheet http://www.sequans.com/role/Incometax Income tax Notes 15 false false R16.htm 9952164 - Disclosure - Earnings (loss) per share Sheet http://www.sequans.com/role/Earningslosspershare Earnings (loss) per share Notes 16 false false R17.htm 9952165 - Disclosure - Property, plant and equipment Sheet http://www.sequans.com/role/Propertyplantandequipment Property, plant and equipment Notes 17 false false R18.htm 9952166 - Disclosure - Intangible assets Sheet http://www.sequans.com/role/Intangibleassets Intangible assets Notes 18 false false R19.htm 9952167 - Disclosure - Digital assets Sheet http://www.sequans.com/role/Digitalassets Digital assets Notes 19 false false R20.htm 9952168 - Disclosure - Inventories Sheet http://www.sequans.com/role/Inventories Inventories Notes 20 false false R21.htm 9952169 - Disclosure - Trade receivables Sheet http://www.sequans.com/role/Tradereceivables Trade receivables Notes 21 false false R22.htm 9952170 - Disclosure - Cash and cash equivalents Sheet http://www.sequans.com/role/Cashandcashequivalents Cash and cash equivalents Notes 22 false false R23.htm 9952172 - Disclosure - Share-based payment plans Sheet http://www.sequans.com/role/Sharebasedpaymentplans Share-based payment plans Notes 23 false false R24.htm 9952173 - Disclosure - Interest-bearing loans and borrowings Sheet http://www.sequans.com/role/Interestbearingloansandborrowings Interest-bearing loans and borrowings Notes 24 false false R25.htm 9952174 - Disclosure - Lease liabilities Sheet http://www.sequans.com/role/Leaseliabilities Lease liabilities Notes 25 false false R26.htm 9952175 - Disclosure - Government grant advances and loans Sheet http://www.sequans.com/role/Governmentgrantadvancesandloans Government grant advances and loans Notes 26 false false R27.htm 9952176 - Disclosure - Provisions Sheet http://www.sequans.com/role/Provisions Provisions Notes 27 false false R28.htm 9952177 - Disclosure - Other non-current liabilities Sheet http://www.sequans.com/role/Othernoncurrentliabilities Other non-current liabilities Notes 28 false false R29.htm 9952178 - Disclosure - Trade payables and other current liabilities Sheet http://www.sequans.com/role/Tradepayablesandothercurrentliabilities Trade payables and other current liabilities Notes 29 false false R30.htm 9952179 - Disclosure - Information about financial instruments Sheet http://www.sequans.com/role/Informationaboutfinancialinstruments Information about financial instruments Notes 30 false false R31.htm 9952180 - Disclosure - Commitments and contingencies Sheet http://www.sequans.com/role/Commitmentsandcontingencies Commitments and contingencies Notes 31 false false R32.htm 9952181 - Disclosure - Related party disclosures Sheet http://www.sequans.com/role/Relatedpartydisclosures Related party disclosures Notes 32 false false R33.htm 9952182 - Disclosure - Events after the reporting date Sheet http://www.sequans.com/role/Eventsafterthereportingdate Events after the reporting date Notes 33 false false R34.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 34 false false R35.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 35 false false R36.htm 9955511 - Disclosure - Summary of significant accounting and reporting policies (Policies) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesPolicies Summary of significant accounting and reporting policies (Policies) Policies 36 false false R37.htm 9955512 - Disclosure - Summary of significant accounting and reporting policies (Tables) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesTables Summary of significant accounting and reporting policies (Tables) Tables http://www.sequans.com/role/Summaryofsignificantaccountingandreportingpolicies 37 false false R38.htm 9955513 - Disclosure - Acquisition of ACP Advanced Circuit Pursuit AG (Tables) Sheet http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAGTables Acquisition of ACP Advanced Circuit Pursuit AG (Tables) Tables http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAG 38 false false R39.htm 9955514 - Disclosure - Segment information (Tables) Sheet http://www.sequans.com/role/SegmentinformationTables Segment information (Tables) Tables http://www.sequans.com/role/Segmentinformation 39 false false R40.htm 9955515 - Disclosure - Other revenues and expenses (Tables) Sheet http://www.sequans.com/role/OtherrevenuesandexpensesTables Other revenues and expenses (Tables) Tables http://www.sequans.com/role/Otherrevenuesandexpenses 40 false false R41.htm 9955516 - Disclosure - Income tax (Tables) Sheet http://www.sequans.com/role/IncometaxTables Income tax (Tables) Tables http://www.sequans.com/role/Incometax 41 false false R42.htm 9955517 - Disclosure - Earnings (loss) per share (Tables) Sheet http://www.sequans.com/role/EarningslosspershareTables Earnings (loss) per share (Tables) Tables http://www.sequans.com/role/Earningslosspershare 42 false false R43.htm 9955518 - Disclosure - Property, plant and equipment (Tables) Sheet http://www.sequans.com/role/PropertyplantandequipmentTables Property, plant and equipment (Tables) Tables http://www.sequans.com/role/Propertyplantandequipment 43 false false R44.htm 9955519 - Disclosure - Intangible assets (Tables) Sheet http://www.sequans.com/role/IntangibleassetsTables Intangible assets (Tables) Tables http://www.sequans.com/role/Intangibleassets 44 false false R45.htm 9955520 - Disclosure - Digital assets (Tables) Sheet http://www.sequans.com/role/DigitalassetsTables Digital assets (Tables) Tables http://www.sequans.com/role/Digitalassets 45 false false R46.htm 9955521 - Disclosure - Inventories (Tables) Sheet http://www.sequans.com/role/InventoriesTables Inventories (Tables) Tables http://www.sequans.com/role/Inventories 46 false false R47.htm 9955522 - Disclosure - Trade receivables (Tables) Sheet http://www.sequans.com/role/TradereceivablesTables Trade receivables (Tables) Tables http://www.sequans.com/role/Tradereceivables 47 false false R48.htm 9955523 - Disclosure - Cash and cash equivalents (Tables) Sheet http://www.sequans.com/role/CashandcashequivalentsTables Cash and cash equivalents (Tables) Tables http://www.sequans.com/role/Cashandcashequivalents 48 false false R49.htm 9955524 - Disclosure - Issued capital and reserves (Tables) Sheet http://www.sequans.com/role/IssuedcapitalandreservesTables Issued capital and reserves (Tables) Tables 49 false false R50.htm 9955525 - Disclosure - Share-based payment plans (Tables) Sheet http://www.sequans.com/role/SharebasedpaymentplansTables Share-based payment plans (Tables) Tables http://www.sequans.com/role/Sharebasedpaymentplans 50 false false R51.htm 9955526 - Disclosure - Interest-bearing loans and borrowings (Tables) Sheet http://www.sequans.com/role/InterestbearingloansandborrowingsTables Interest-bearing loans and borrowings (Tables) Tables http://www.sequans.com/role/Interestbearingloansandborrowings 51 false false R52.htm 9955527 - Disclosure - Lease liabilities (Tables) Sheet http://www.sequans.com/role/LeaseliabilitiesTables Lease liabilities (Tables) Tables http://www.sequans.com/role/Leaseliabilities 52 false false R53.htm 9955528 - Disclosure - Government grant advances and loans (Tables) Sheet http://www.sequans.com/role/GovernmentgrantadvancesandloansTables Government grant advances and loans (Tables) Tables http://www.sequans.com/role/Governmentgrantadvancesandloans 53 false false R54.htm 9955529 - Disclosure - Provisions (Tables) Sheet http://www.sequans.com/role/ProvisionsTables Provisions (Tables) Tables http://www.sequans.com/role/Provisions 54 false false R55.htm 9955530 - Disclosure - Other non-current liabilities (Tables) Sheet http://www.sequans.com/role/OthernoncurrentliabilitiesTables Other non-current liabilities (Tables) Tables http://www.sequans.com/role/Othernoncurrentliabilities 55 false false R56.htm 9955531 - Disclosure - Trade payables and other current liabilities (Tables) Sheet http://www.sequans.com/role/TradepayablesandothercurrentliabilitiesTables Trade payables and other current liabilities (Tables) Tables http://www.sequans.com/role/Tradepayablesandothercurrentliabilities 56 false false R57.htm 9955532 - Disclosure - Information about financial instruments (Tables) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsTables Information about financial instruments (Tables) Tables http://www.sequans.com/role/Informationaboutfinancialinstruments 57 false false R58.htm 9955534 - Disclosure - Related party disclosures (Tables) Sheet http://www.sequans.com/role/RelatedpartydisclosuresTables Related party disclosures (Tables) Tables http://www.sequans.com/role/Relatedpartydisclosures 58 false false R59.htm 9955535 - Disclosure - Summary of significant accounting and reporting policies - Narrative (Details) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesNarrativeDetails Summary of significant accounting and reporting policies - Narrative (Details) Details http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesTables 59 false false R60.htm 9955536 - Disclosure - Summary of significant accounting and reporting policies - Schedule of Subsidiaries (Details) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesScheduleofSubsidiariesDetails Summary of significant accounting and reporting policies - Schedule of Subsidiaries (Details) Details 60 false false R61.htm 9955537 - Disclosure - Summary of significant accounting and reporting policies - Schedule of Average and Closing Exchange Rate for the U.S. Dollar (Details) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesScheduleofAverageandClosingExchangeRatefortheUSDollarDetails Summary of significant accounting and reporting policies - Schedule of Average and Closing Exchange Rate for the U.S. Dollar (Details) Details 61 false false R62.htm 9955538 - Disclosure - Summary of significant accounting and reporting policies - Performance Obligation (Details) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesPerformanceObligationDetails Summary of significant accounting and reporting policies - Performance Obligation (Details) Details 62 false false R63.htm 9955539 - Disclosure - Summary of significant accounting and reporting policies - Schedule of Useful Lives Most Commonly Used (Details) Sheet http://www.sequans.com/role/SummaryofsignificantaccountingandreportingpoliciesScheduleofUsefulLivesMostCommonlyUsedDetails Summary of significant accounting and reporting policies - Schedule of Useful Lives Most Commonly Used (Details) Details 63 false false R64.htm 9955540 - Disclosure - Acquisition of ACP Advanced Circuit Pursuit AG - Disclosure of detailed information about business combination (Details) Sheet http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAGDisclosureofdetailedinformationaboutbusinesscombinationDetails Acquisition of ACP Advanced Circuit Pursuit AG - Disclosure of detailed information about business combination (Details) Details 64 false false R65.htm 9955541 - Disclosure - Acquisition of ACP Advanced Circuit Pursuit AG (Details) Sheet http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAGDetails Acquisition of ACP Advanced Circuit Pursuit AG (Details) Details http://www.sequans.com/role/AcquisitionofACPAdvancedCircuitPursuitAGTables 65 false false R66.htm 9955542 - Disclosure - 4G technology sale to Qualcomm and related agreements (Details) Sheet http://www.sequans.com/role/A4GtechnologysaletoQualcommandrelatedagreementsDetails 4G technology sale to Qualcomm and related agreements (Details) Details http://www.sequans.com/role/A4GtechnologysaletoQualcommandrelatedagreements 66 false false R67.htm 9955543 - Disclosure - Segment information (Details) Sheet http://www.sequans.com/role/SegmentinformationDetails Segment information (Details) Details http://www.sequans.com/role/SegmentinformationTables 67 false false R68.htm 9955544 - Disclosure - Other revenues and expenses - Schedule of Financial Income and Expenses (Details) Sheet http://www.sequans.com/role/OtherrevenuesandexpensesScheduleofFinancialIncomeandExpensesDetails Other revenues and expenses - Schedule of Financial Income and Expenses (Details) Details 68 false false R69.htm 9955545 - Disclosure - Other revenues and expenses - Financial Income and Expenses (Narrative) (Details) Sheet http://www.sequans.com/role/OtherrevenuesandexpensesFinancialIncomeandExpensesNarrativeDetails Other revenues and expenses - Financial Income and Expenses (Narrative) (Details) Details 69 false false R70.htm 9955546 - Disclosure - Other revenues and expenses - Schedule of Cost of Revenue, Operating Expenses, and Employee Benefits (Details) Sheet http://www.sequans.com/role/OtherrevenuesandexpensesScheduleofCostofRevenueOperatingExpensesandEmployeeBenefitsDetails Other revenues and expenses - Schedule of Cost of Revenue, Operating Expenses, and Employee Benefits (Details) Details 70 false false R71.htm 9955547 - Disclosure - Other revenues and expenses - Research and Development Expense and Tax Credit Receivable (Details) Sheet http://www.sequans.com/role/OtherrevenuesandexpensesResearchandDevelopmentExpenseandTaxCreditReceivableDetails Other revenues and expenses - Research and Development Expense and Tax Credit Receivable (Details) Details 71 false false R72.htm 9955548 - Disclosure - Income tax - Schedule of Major Components of Income Tax Expense (Details) Sheet http://www.sequans.com/role/IncometaxScheduleofMajorComponentsofIncomeTaxExpenseDetails Income tax - Schedule of Major Components of Income Tax Expense (Details) Details 72 false false R73.htm 9955549 - Disclosure - Income tax - Narrative (Details) Sheet http://www.sequans.com/role/IncometaxNarrativeDetails Income tax - Narrative (Details) Details 73 false false R74.htm 9955550 - Disclosure - Income tax - Reconciliation of Income Taxes Computed at the French Statutory Rate (Details) Sheet http://www.sequans.com/role/IncometaxReconciliationofIncomeTaxesComputedattheFrenchStatutoryRateDetails Income tax - Reconciliation of Income Taxes Computed at the French Statutory Rate (Details) Details 74 false false R75.htm 9955551 - Disclosure - Income tax - Summary of Deferred Tax Assets (Details) Sheet http://www.sequans.com/role/IncometaxSummaryofDeferredTaxAssetsDetails Income tax - Summary of Deferred Tax Assets (Details) Details 75 false false R76.htm 9955552 - Disclosure - Income tax - Significant Components of Deferred Tax Assets and Liabilities (Details) Sheet http://www.sequans.com/role/IncometaxSignificantComponentsofDeferredTaxAssetsandLiabilitiesDetails Income tax - Significant Components of Deferred Tax Assets and Liabilities (Details) Details 76 false false R77.htm 9955553 - Disclosure - Earnings (loss) per share - Schedule of income and share data used in basic and diluted earnings (loss) per share computations (Details) Sheet http://www.sequans.com/role/EarningslosspershareScheduleofincomeandsharedatausedinbasicanddilutedearningslosspersharecomputationsDetails Earnings (loss) per share - Schedule of income and share data used in basic and diluted earnings (loss) per share computations (Details) Details http://www.sequans.com/role/EarningslosspershareTables 77 false false R78.htm 9955554 - Disclosure - Earnings (loss) per share - Narrative (Details) Sheet http://www.sequans.com/role/EarningslosspershareNarrativeDetails Earnings (loss) per share - Narrative (Details) Details http://www.sequans.com/role/EarningslosspershareTables 78 false false R79.htm 9955555 - Disclosure - Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) Sheet http://www.sequans.com/role/PropertyplantandequipmentScheduleofPropertyPlantandEquipmentDetails Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) Details 79 false false R80.htm 9955556 - Disclosure - Property, plant and equipment - Narrative (Details) Sheet http://www.sequans.com/role/PropertyplantandequipmentNarrativeDetails Property, plant and equipment - Narrative (Details) Details 80 false false R81.htm 9955557 - Disclosure - Intangible assets (Details) Sheet http://www.sequans.com/role/IntangibleassetsDetails Intangible assets (Details) Details http://www.sequans.com/role/IntangibleassetsTables 81 false false R82.htm 9955558 - Disclosure - Intangible assets - Narrative (Details) Sheet http://www.sequans.com/role/IntangibleassetsNarrativeDetails Intangible assets - Narrative (Details) Details 82 false false R83.htm 9955559 - Disclosure - Digital assets - Disclosure of number of Bitcoin (Details) Sheet http://www.sequans.com/role/DigitalassetsDisclosureofnumberofBitcoinDetails Digital assets - Disclosure of number of Bitcoin (Details) Details 83 false false R84.htm 9955560 - Disclosure - Digital assets - Disclosure of investment in Bitcoin (Details) Sheet http://www.sequans.com/role/DigitalassetsDisclosureofinvestmentinBitcoinDetails Digital assets - Disclosure of investment in Bitcoin (Details) Details 84 false false R85.htm 9955561 - Disclosure - Digital assets (Details) Sheet http://www.sequans.com/role/DigitalassetsDetails Digital assets (Details) Details http://www.sequans.com/role/DigitalassetsTables 85 false false R86.htm 9955562 - Disclosure - Inventories - Schedule of Inventories (Details) Sheet http://www.sequans.com/role/InventoriesScheduleofInventoriesDetails Inventories - Schedule of Inventories (Details) Details 86 false false R87.htm 9955563 - Disclosure - Inventories - Narrative (Details) Sheet http://www.sequans.com/role/InventoriesNarrativeDetails Inventories - Narrative (Details) Details 87 false false R88.htm 9955564 - Disclosure - Trade receivables - Schedule of Non-Interest Bearing Trade Receivables (Details) Sheet http://www.sequans.com/role/TradereceivablesScheduleofNonInterestBearingTradeReceivablesDetails Trade receivables - Schedule of Non-Interest Bearing Trade Receivables (Details) Details 88 false false R89.htm 9955565 - Disclosure - Trade receivables - Schedule of Movements in the Provision for Impairment of Receivables (Details) Sheet http://www.sequans.com/role/TradereceivablesScheduleofMovementsintheProvisionforImpairmentofReceivablesDetails Trade receivables - Schedule of Movements in the Provision for Impairment of Receivables (Details) Details 89 false false R90.htm 9955566 - Disclosure - Trade receivables - Aging Analysis of Trade Receivables That Were Not Impaired (Details) Sheet http://www.sequans.com/role/TradereceivablesAgingAnalysisofTradeReceivablesThatWereNotImpairedDetails Trade receivables - Aging Analysis of Trade Receivables That Were Not Impaired (Details) Details 90 false false R91.htm 9955567 - Disclosure - Cash and cash equivalents - Schedule of Cash and Cash Equivalents (Details) Sheet http://www.sequans.com/role/CashandcashequivalentsScheduleofCashandCashEquivalentsDetails Cash and cash equivalents - Schedule of Cash and Cash Equivalents (Details) Details 91 false false R92.htm 9955568 - Disclosure - Cash and cash equivalents - Schedule of Cash and Cash Equivalents Held in U.S. dollar and Euros (Details) Sheet http://www.sequans.com/role/CashandcashequivalentsScheduleofCashandCashEquivalentsHeldinUSdollarandEurosDetails Cash and cash equivalents - Schedule of Cash and Cash Equivalents Held in U.S. dollar and Euros (Details) Details 92 false false R93.htm 9955569 - Disclosure - Issued capital and reserves - Narratives (Details) Sheet http://www.sequans.com/role/IssuedcapitalandreservesNarrativesDetails Issued capital and reserves - Narratives (Details) Details 93 false false R94.htm 9955570 - Disclosure - Issued capital and reserves - Authorized capital, in number of shares (Details) Sheet http://www.sequans.com/role/IssuedcapitalandreservesAuthorizedcapitalinnumberofsharesDetails Issued capital and reserves - Authorized capital, in number of shares (Details) Details 94 false false R95.htm 9955571 - Disclosure - Issued capital and reserves - Shares Issued and Fully Paid (Details) Sheet http://www.sequans.com/role/IssuedcapitalandreservesSharesIssuedandFullyPaidDetails Issued capital and reserves - Shares Issued and Fully Paid (Details) Details 95 false false R96.htm 9955572 - Disclosure - Issued capital and reserves - Capital Transactions (Details) Sheet http://www.sequans.com/role/IssuedcapitalandreservesCapitalTransactionsDetails Issued capital and reserves - Capital Transactions (Details) Details 96 false false R97.htm 9955573 - Disclosure - Share-based payment plans - Narrative (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansNarrativeDetails Share-based payment plans - Narrative (Details) Details 97 false false R98.htm 9955574 - Disclosure - Share-based payment plans - Breakdown of share-based payments expenses (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansBreakdownofsharebasedpaymentsexpensesDetails Share-based payment plans - Breakdown of share-based payments expenses (Details) Details 98 false false R99.htm 9955575 - Disclosure - Share-based payment plans - General employee stock option, founders warrant plans and restricted shares awards (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansGeneralemployeestockoptionfounderswarrantplansandrestrictedsharesawardsDetails Share-based payment plans - General employee stock option, founders warrant plans and restricted shares awards (Details) Details 99 false false R100.htm 9955576 - Disclosure - Share-based payment plans - Warrant plans for certain consultants considered equivalent to employees (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansWarrantplansforcertainconsultantsconsideredequivalenttoemployeesDetails Share-based payment plans - Warrant plans for certain consultants considered equivalent to employees (Details) Details 100 false false R101.htm 9955577 - Disclosure - Share-based payment plans - Movements in number and WAEP (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansMovementsinnumberandWAEPDetails Share-based payment plans - Movements in number and WAEP (Details) Details 101 false false R102.htm 9955578 - Disclosure - Share-based payment plans - Movements in number and restricted shares awards (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansMovementsinnumberandrestrictedsharesawardsDetails Share-based payment plans - Movements in number and restricted shares awards (Details) Details 102 false false R103.htm 9955579 - Disclosure - Share-based payment plans - Valuation assumptions (Details) Sheet http://www.sequans.com/role/SharebasedpaymentplansValuationassumptionsDetails Share-based payment plans - Valuation assumptions (Details) Details 103 false false R104.htm 9955580 - Disclosure - Interest-bearing loans and borrowings - Schedule of Interest-Bearing Loans and Borrowings (Details) Sheet http://www.sequans.com/role/InterestbearingloansandborrowingsScheduleofInterestBearingLoansandBorrowingsDetails Interest-bearing loans and borrowings - Schedule of Interest-Bearing Loans and Borrowings (Details) Details 104 false false R105.htm 9955581 - Disclosure - Interest-bearing loans and borrowings - Convertible Debt (Details) Sheet http://www.sequans.com/role/InterestbearingloansandborrowingsConvertibleDebtDetails Interest-bearing loans and borrowings - Convertible Debt (Details) Details 105 false false R106.htm 9955582 - Disclosure - Interest-bearing loans and borrowings - Unsecured related party loan (Details) Sheet http://www.sequans.com/role/InterestbearingloansandborrowingsUnsecuredrelatedpartyloanDetails Interest-bearing loans and borrowings - Unsecured related party loan (Details) Details 106 false false R107.htm 9955583 - Disclosure - Interest-bearing loans and borrowings - Interest-Bearing Financing Receivables (Details) Sheet http://www.sequans.com/role/InterestbearingloansandborrowingsInterestBearingFinancingReceivablesDetails Interest-bearing loans and borrowings - Interest-Bearing Financing Receivables (Details) Details 107 false false R108.htm 9955584 - Disclosure - Lease liabilities - Narrative (Details) Sheet http://www.sequans.com/role/LeaseliabilitiesNarrativeDetails Lease liabilities - Narrative (Details) Details 108 false false R109.htm 9955585 - Disclosure - Lease liabilities - Summary of movements in right-of-use assets and lease liabilities (Details) Sheet http://www.sequans.com/role/LeaseliabilitiesSummaryofmovementsinrightofuseassetsandleaseliabilitiesDetails Lease liabilities - Summary of movements in right-of-use assets and lease liabilities (Details) Details 109 false false R110.htm 9955586 - Disclosure - Government grant advances and loans - Schedule of Government Grant Advances and Loans (Details) Sheet http://www.sequans.com/role/GovernmentgrantadvancesandloansScheduleofGovernmentGrantAdvancesandLoansDetails Government grant advances and loans - Schedule of Government Grant Advances and Loans (Details) Details 110 false false R111.htm 9955587 - Disclosure - Government grant advances and loans - Government Grant Advances (Details) Sheet http://www.sequans.com/role/GovernmentgrantadvancesandloansGovernmentGrantAdvancesDetails Government grant advances and loans - Government Grant Advances (Details) Details 111 false false R112.htm 9955588 - Disclosure - Government grant advances and loans - Research Project Financing (Details) Sheet http://www.sequans.com/role/GovernmentgrantadvancesandloansResearchProjectFinancingDetails Government grant advances and loans - Research Project Financing (Details) Details 112 false false R113.htm 9955589 - Disclosure - Government grant advances and loans - Government Loans (Details) Sheet http://www.sequans.com/role/GovernmentgrantadvancesandloansGovernmentLoansDetails Government grant advances and loans - Government Loans (Details) Details 113 false false R114.htm 9955590 - Disclosure - Provisions - Reconciliation of Changes in Provisions (Details) Sheet http://www.sequans.com/role/ProvisionsReconciliationofChangesinProvisionsDetails Provisions - Reconciliation of Changes in Provisions (Details) Details 114 false false R115.htm 9955591 - Disclosure - Provisions - Narrative (Details) Sheet http://www.sequans.com/role/ProvisionsNarrativeDetails Provisions - Narrative (Details) Details 115 false false R116.htm 9955592 - Disclosure - Provisions - Schedule of Main Assumptions Used (Details) Sheet http://www.sequans.com/role/ProvisionsScheduleofMainAssumptionsUsedDetails Provisions - Schedule of Main Assumptions Used (Details) Details 116 false false R117.htm 9955593 - Disclosure - Provisions -Disclosure of reconciliation of defined benefit obligation (Details) Sheet http://www.sequans.com/role/ProvisionsDisclosureofreconciliationofdefinedbenefitobligationDetails Provisions -Disclosure of reconciliation of defined benefit obligation (Details) Details 117 false false R118.htm 9955594 - Disclosure - Provisions - Reconciliation of defined benefit obligation (Details) Sheet http://www.sequans.com/role/ProvisionsReconciliationofdefinedbenefitobligationDetails Provisions - Reconciliation of defined benefit obligation (Details) Details 118 false false R119.htm 9955595 - Disclosure - Provisions - Disclosure of reconciliation of fair value of plan assets (Details) Sheet http://www.sequans.com/role/ProvisionsDisclosureofreconciliationoffairvalueofplanassetsDetails Provisions - Disclosure of reconciliation of fair value of plan assets (Details) Details 119 false false R120.htm 9955596 - Disclosure - Provisions - Disclosure of sensitivity analysis for actuarial assumptions (Details) Sheet http://www.sequans.com/role/ProvisionsDisclosureofsensitivityanalysisforactuarialassumptionsDetails Provisions - Disclosure of sensitivity analysis for actuarial assumptions (Details) Details 120 false false R121.htm 9955597 - Disclosure - Other non-current liabilities - Schedule of Other Non-Current Liabilities (Details) Sheet http://www.sequans.com/role/OthernoncurrentliabilitiesScheduleofOtherNonCurrentLiabilitiesDetails Other non-current liabilities - Schedule of Other Non-Current Liabilities (Details) Details 121 false false R122.htm 9955598 - Disclosure - Other non-current liabilities - Narrative (Details) Sheet http://www.sequans.com/role/OthernoncurrentliabilitiesNarrativeDetails Other non-current liabilities - Narrative (Details) Details 122 false false R123.htm 9955599 - Disclosure - Trade payables and other current liabilities - Schedule of Trade Payables and Other Current Liabilities (Details) Sheet http://www.sequans.com/role/TradepayablesandothercurrentliabilitiesScheduleofTradePayablesandOtherCurrentLiabilitiesDetails Trade payables and other current liabilities - Schedule of Trade Payables and Other Current Liabilities (Details) Details 123 false false R124.htm 9955600 - Disclosure - Trade payables and other current liabilities - Narrative (Details) Sheet http://www.sequans.com/role/TradepayablesandothercurrentliabilitiesNarrativeDetails Trade payables and other current liabilities - Narrative (Details) Details 124 false false R125.htm 9955601 - Disclosure - Information about financial instruments - Schedule of Financial Assets and Financial Liabilities (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsScheduleofFinancialAssetsandFinancialLiabilitiesDetails Information about financial instruments - Schedule of Financial Assets and Financial Liabilities (Details) Details 125 false false R126.htm 9955602 - Disclosure - Information about financial instruments - Schedule of Assets and Liabilities Measured at Fair Value (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsScheduleofAssetsandLiabilitiesMeasuredatFairValueDetails Information about financial instruments - Schedule of Assets and Liabilities Measured at Fair Value (Details) Details 126 false false R127.htm 9955603 - Disclosure - Information about financial instruments - Schedule of Present Fair Values of Derivative Financial Instruments (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsScheduleofPresentFairValuesofDerivativeFinancialInstrumentsDetails Information about financial instruments - Schedule of Present Fair Values of Derivative Financial Instruments (Details) Details 127 false false R128.htm 9955604 - Disclosure - Information about financial instruments - Narrative (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsNarrativeDetails Information about financial instruments - Narrative (Details) Details 128 false false R129.htm 9955605 - Disclosure - Information about financial instruments - Summary of Customers Representing Company's Total Revenue (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsSummaryofCustomersRepresentingCompanysTotalRevenueDetails Information about financial instruments - Summary of Customers Representing Company's Total Revenue (Details) Details 129 false false R130.htm 9955606 - Disclosure - Information about financial instruments - Schedule of Liquidity Risk (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsScheduleofLiquidityRiskDetails Information about financial instruments - Schedule of Liquidity Risk (Details) Details 130 false false R131.htm 9955607 - Disclosure - Information about financial instruments - Changes in Liabilities Arising from Financing Activities (Details) Sheet http://www.sequans.com/role/InformationaboutfinancialinstrumentsChangesinLiabilitiesArisingfromFinancingActivitiesDetails Information about financial instruments - Changes in Liabilities Arising from Financing Activities (Details) Details 131 false false R132.htm 9955608 - Disclosure - Commitments and contingencies - Contingencies (Details) Sheet http://www.sequans.com/role/CommitmentsandcontingenciesContingenciesDetails Commitments and contingencies - Contingencies (Details) Details 132 false false R133.htm 9955609 - Disclosure - Commitments and contingencies - Bank Guarantee (Details) Sheet http://www.sequans.com/role/CommitmentsandcontingenciesBankGuaranteeDetails Commitments and contingencies - Bank Guarantee (Details) Details 133 false false R134.htm 9955611 - Disclosure - Commitments and contingencies - Purchase Commitments (Details) Sheet http://www.sequans.com/role/CommitmentsandcontingenciesPurchaseCommitmentsDetails Commitments and contingencies - Purchase Commitments (Details) Details 134 false false R135.htm 9955613 - Disclosure - Related party disclosures - Narrative (Details) Sheet http://www.sequans.com/role/RelatedpartydisclosuresNarrativeDetails Related party disclosures - Narrative (Details) Details 135 false false R136.htm 9955614 - Disclosure - Related party disclosures - Compensation of Key Management Personnel (Details) Sheet http://www.sequans.com/role/RelatedpartydisclosuresCompensationofKeyManagementPersonnelDetails Related party disclosures - Compensation of Key Management Personnel (Details) Details 136 false false R137.htm 9955615 - Disclosure - Related party disclosures - Directors??? Interests In An Employee Share Incentive Plan (Details) Sheet http://www.sequans.com/role/RelatedpartydisclosuresDirectorsInterestsInAnEmployeeShareIncentivePlanDetails Related party disclosures - Directors??? Interests In An Employee Share Incentive Plan (Details) Details 137 false false R138.htm 9955616 - Disclosure - Events after the reporting date (Details) Sheet http://www.sequans.com/role/EventsafterthereportingdateDetails Events after the reporting date (Details) Details http://www.sequans.com/role/Eventsafterthereportingdate 138 false false All Reports Book All Reports sqns-20251231.htm sqns-20251231.xsd sqns-20251231_cal.xml sqns-20251231_def.xml sqns-20251231_lab.xml sqns-20251231_pre.xml http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full true true