SEQUANS COMMUNICATIONS (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 0001000 - Document - Document and Entity Information Network

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 http://www.sequans.com/role/DocumentAndEntityInformation
2 Implied Table Table

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 implied:Table
3 Document and Entity Information [Abstract] Abstract sqns:DocumentandEntityInformationAbstract
4 Document Type Concept (Submission Type) For Period dei:DocumentType
5 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
6 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
7 Amendment Description Concept (Text/String) For Period dei:AmendmentDescription
8 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
9 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
10 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
11 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
12 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
13 Entity Well Known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
14 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
15 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
16 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
17 1001000 - Statement - Consolidated Statements of Operations Network

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 http://www.sequans.com/role/ConsolidatedStatementsOfOperations
18 Implied Table Table

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 implied:Table
19 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
20 Revenue: Abstract ifrs-full:RevenueAbstract
21 Product revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGoods
22 Other revenue Concept (Monetary) For Period Credit ifrs-full:OtherRevenue
23 Total revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
24 Cost of revenue: Abstract sqns:CostOfRevenueAbstractAbstract
25 Cost of product revenue Concept (Monetary) For Period Debit ifrs-full:CostOfMerchandiseSold
26 Cost of other revenue Concept (Monetary) For Period Debit sqns:CostOfOtherRevenue
27 Total cost of revenue Concept (Monetary) For Period Debit ifrs-full:CostOfSales
28 Gross profit Concept (Monetary) For Period Credit ifrs-full:GrossProfit
29 Operating expenses: Abstract sqns:OperatingExpenses1Abstract
30 Research and development Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
31 Sales and marketing Concept (Monetary) For Period Debit ifrs-full:SalesAndMarketingExpense
32 General and administrative Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
33 Total operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
34 Operating income (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
35 Financial income (expense): Abstract sqns:FinancialIncomeExpenseAbstract
36 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
37 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
38 Other financial expense Concept (Monetary) For Period Debit ifrs-full:OtherFinanceCost
39 Convertible debt amendments Concept (Monetary) For Period Debit sqns:ConvertibleDebtAmendmentNet
40 Change in the fair value of convertible debt embedded derivative Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
41 Foreign exchange gain (loss), net Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
42 Profit (Loss) before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
43 Income tax expense (benefit) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
44 Profit (Loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
45 Attributable to: Abstract ifrs-full:ProfitLossAttributableToAbstract
46 Shareholders of the parent Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
47 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
48 Basic earnings (loss) per share (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
49 Diluted earnings (loss) per share (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
50 Weighted average number of shares used for computing: Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
51 Basic (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
52 Diluted (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
53 1002000 - Statement - Consolidated Statements of Comprehensive Income (Loss) Statement Network

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 http://www.sequans.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossStatement
54 Implied Table Table

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55 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
56 Profit (Loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
57 Other comprehensive income (loss) Abstract ifrs-full:OtherComprehensiveIncomeAbstract
58 Other comprehensive income to be reclassified to profit or loss in subsequent years : Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
59 Net gain (loss) on cash flow hedge Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
60 Exchange differences on translation of foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
61 Net other comprehensive income to be reclassified to profit or loss in subsequent years Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
62 Other comprehensive income not to be reclassified to profit or loss in subsequent years : Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
63 Re-measurement gains (losses) on defined benefit plans Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
64 Net other comprehensive income not to be reclassified to profit or loss in subsequent years Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax
65 Total other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
66 Total comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
67 Attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
68 Shareholders of the parent Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
69 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
70 1003000 - Statement - Consolidated Statements of Financial Position Network

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 http://www.sequans.com/role/ConsolidatedStatementsOfFinancialPosition
71 Implied Table Table

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72 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
73 ASSETS Abstract ifrs-full:AssetsAbstract
74 Non-current assets: Abstract ifrs-full:NoncurrentAssetsAbstract
75 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
76 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
77 Deposits and other receivables Concept (Monetary) As Of Debit ifrs-full:NoncurrentLoansAndReceivables
78 Available for sale financial assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
79 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
80 Current assets: Abstract ifrs-full:CurrentAssetsAbstract
81 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
82 Trade receivables Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
83 Prepaid expenses and other receivables Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaymentsAndOtherCurrentAssets
84 Recoverable value added tax Concept (Monetary) As Of Debit ifrs-full:CurrentValueAddedTaxReceivables
85 Research tax credit receivable Concept (Monetary) As Of Debit ifrs-full:CurrentReceivablesFromTaxesOtherThanIncomeTax
86 Deposit Concept (Monetary) As Of Debit sqns:CurrentDepositAssets
87 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
88 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
89 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
90 EQUITY AND LIABILITIES Abstract ifrs-full:EquityAndLiabilitiesAbstract
91 Equity: Abstract ifrs-full:EquityAbstract
92 Issued capital, euro 0.02 nominal value, 80,024,707 shares issued and outstanding at December 31, 2017 (75,030,078 and 59,166,741 at December 31, 2016 and 2015, respectively) Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
93 Share premium Concept (Monetary) As Of Credit ifrs-full:SharePremium
94 Other capital reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
95 Accumulated deficit Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
96 Other components of equity Concept (Monetary) As Of Credit ifrs-full:OtherEquityInterest
97 Total equity (deficit) Concept (Monetary) As Of Credit ifrs-full:Equity
98 Non-current liabilities: Abstract ifrs-full:NoncurrentLiabilitiesAbstract
99 Government grant advances and loans Concept (Monetary) As Of Credit ifrs-full:NoncurrentGovernmentGrants
100 Convertible debt and accrued interest Concept (Monetary) As Of Credit sqns:NonCurrentPortionOfNonCurrentConvertibleBorrowingsIssued
101 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
102 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
103 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
104 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
105 Current liabilities: Abstract ifrs-full:CurrentLiabilitiesAbstract
106 Trade payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
107 Interest-bearing financing of receivables Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
108 Government grant advances and loans Concept (Monetary) As Of Credit ifrs-full:CurrentGovernmentGrants
109 Convertible debt embedded derivative Concept (Monetary) As Of Credit ifrs-full:CurrentDerivativeFinancialLiabilities
110 Finance lease obligations Concept (Monetary) As Of Credit ifrs-full:CurrentFinanceLeaseLiabilities
111 Other current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
112 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
113 Provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
114 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
115 Total equity and liabilities Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
116 1003001 - Statement - Consolidated Statements of Financial Position (Parenthetical) Network

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 http://www.sequans.com/role/ConsolidatedStatementsOfFinancialPositionParenthetical
117 Implied Table Table

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118 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
119 Nominal value (euro per share) Concept (Share) As Of ifrs-full:ParValuePerShare
120 Shares issued (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
121 Shares outstanding (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
122 1004000 - Statement - Consolidated Statements of Changes in Equity (Deficit) Statement Network

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 http://www.sequans.com/role/ConsolidatedStatementsOfChangesInEquityDeficitStatement
123 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
124 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
125 Equity [member] Member ifrs-full:EquityMember
126 Ordinary shares Member ifrs-full:IssuedCapitalMember
127 Share premium Member ifrs-full:SharePremiumMember
128 Other capital reserves Member ifrs-full:OtherReservesMember
129 Accumulated deficit Member ifrs-full:RetainedEarningsMember
130 Cumulative translation adjustments Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
131 Accumulated other comprehensive income (loss) Member sqns:AccumulatedOtherComprehensiveIncomeExcludingReserveOfExchangeDifferencesOnTranslationMember
132 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
133 Beginning balance (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
134 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Equity
135 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
136 Re-measurement gains (losses) on defined benefit plans Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
137 Foreign currency translation Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
138 Net gain (loss) on cash flow hedge Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
139 Total comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
140 Issue of shares in connection with the exercise of options and warrants (in shares) Concept (Shares) For Period sqns:NumberOfShareOptionsAndWarrantsExercisedInSharebasedPaymentArrangement
141 Issue of shares in connection with the exercise of options and warrants Concept (Monetary) For Period Credit sqns:IncreaseDecreaseThroughExerciseOfOptionsAndWarrantsEquity
142 Transaction costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
143 Share-based payment Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
144 Issue of shares in connection with the public offering of September 2016 (Note 12) (in shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
145 Issue of shares in connection with the public offering of June 2017 (Note 12) Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
146 Reclassification of embedded derivative of convertible debts Concept (Monetary) For Period Credit sqns:IncreaseDecreaseThroughReclassificationOfEmbeddedDerivativeOfConvertibleDebt
147 Conversion of convertible debt (in shares) Concept (Shares) For Period sqns:NumberOfSharesIssuedThroughConversionOfConvertibleInstrumentsEquity
148 Conversion of convertible debt (Note 12) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughConversionOfConvertibleInstruments
149 Convertible debt amendments (Note 14.1) Concept (Monetary) For Period Credit sqns:IncreaseDecreaseThroughConversionOfConvertibleDebtAmendments
150 Ending balance (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
151 Ending balance Concept (Monetary) As Of Credit ifrs-full:Equity
152 1005000 - Statement - Statements of Cash Flow Network

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 http://www.sequans.com/role/StatementsOfCashFlow
153 Implied Table Table

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154 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
155 Operating activities: Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
156 Profit (Loss) before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
157 Non-cash adjustment to reconcile income (loss) before tax to net cash used in operating activities: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
158 Amortization and impairment of property, plant and equipment Concept (Monetary) For Period Debit sqns:AdjustmentsForDepreciationExpenseAndImpairmentLossReversalOfImpairmentLossRecognizedInProfitOrLossPropertyPlantAndEquipment
159 Amortization and impairment of intangible assets Concept (Monetary) For Period Debit sqns:AdjustmentsForAmortisationAndImpairmentLossReversalOfImpairmentLossRecognizedInProfitOrLossIntangibleAssets
160 Share-based payment expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
161 Increase (Decrease) in provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
162 Interest expense, net Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFinanceCosts
163 Convertible debt amendments Concept (Monetary) For Period Debit sqns:AdjustmentsForConvertibleDebtAmendments
164 Change in fair value of convertible debt embedded derivative Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
165 Other financial expenses Concept (Monetary) For Period Debit sqns:AdjustmentsForOtherFinanceCosts
166 Foreign exchange loss (gain) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
167 Loss on disposal of property, plant and equipment Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
168 Working capital adjustments: Abstract sqns:AdjustmentsForWorkingCapitalAbstract
169 Decrease (Increase) in trade receivables and other receivables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
170 Decrease (Increase) in inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
171 Decrease (Increase) in research tax credit receivable Concept (Monetary) For Period Debit sqns:AdjustmentsForDecreaseIncreaseInCurrentReceivablesFromTaxesOtherThanIncomeTax
172 Increase (Decrease) in trade payables and other liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
173 Increase (Decrease) in deferred revenue Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDeferredIncome
174 Decrease in government grant advances Concept (Monetary) For Period Debit sqns:AdjustmentsForDecreaseIncreaseInGovernmentGrantAdvances
175 Income tax paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
176 Net cash flow used in operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
177 Investing activities: Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
178 Purchase of intangible assets and property, plant and equipment Concept (Monetary) For Period Credit sqns:PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities
179 Capitalized development expenditures Concept (Monetary) For Period Credit sqns:PurchasesOfCapitalisedDevelopmentExpendituresClassifiedAsInvestingActivities
180 Sale (Purchase) of financial assets Concept (Monetary) For Period Debit sqns:ProceedsFromPurchasesOfFinancialAssetsClassifiedAsInvestingActivities
181 Increase (Decrease) of short-term deposit Concept (Monetary) For Period Debit sqns:ProceedsFromPurchaseOfShorttermDeposits
182 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsInvestingActivities
183 Net cash flow used in investments activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
184 Financing activities: Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
185 Public equity offering proceeds, net of transaction costs paid Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
186 Proceeds from issue of warrants and exercise of stock options/warrants, net of transaction costs Concept (Monetary) For Period Debit sqns:ProceedsFromIssueOfWarrantsAndExerciseOfOptions
187 Proceeds (repayment of) from interest-bearing receivables financing Concept (Monetary) For Period Debit sqns:ProceedsFromInterestBearingReceivablesFinancing
188 Proceeds from interest-bearing research project financing Concept (Monetary) For Period Debit sqns:ProceedsFromBorrowingsOfResearchProjectFinancingIssued
189 Proceeds from government loans, net of transaction cost Concept (Monetary) For Period Debit sqns:ProceedsFromGovernmentLoansIssued
190 Proceeds from convertible debt, net of transaction cost Concept (Monetary) For Period Debit sqns:ProceedsFromConvertibleBorrowingsIssued
191 Repayment of government loans Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
192 Repayment of borrowings and finance lease liabilities Concept (Monetary) For Period Credit ifrs-full:PaymentsOfFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
193 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
194 Net cash flows from financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
195 Net increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
196 Net foreign exchange difference Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
197 Cash and cash equivalent at January 1 Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
198 Cash and cash equivalents at period end Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
199 2101100 - Disclosure - Corporate information Network

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 http://www.sequans.com/role/CorporateInformation
200 Implied Table Table

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201 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract sqns:CorporateInformationAndStatementOfIFRSComplianceAbstract
202 Corporate information Concept (Text Block (HTML)) For Period sqns:DisclosureOfNatureOfBusinessExplanatoryTextBlock
203 2102100 - Disclosure - Summary of significant accounting and reporting policies Network

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 http://www.sequans.com/role/SummaryOfSignificantAccountingAndReportingPolicies
204 Implied Table Table

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205 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract sqns:CorporateInformationAndStatementOfIFRSComplianceAbstract
206 Summary of significant accounting and reporting policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
207 2103100 - Disclosure - Segment information Network

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 http://www.sequans.com/role/SegmentInformation
208 Implied Table Table

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209 Operating segments [Abstract] Abstract sqns:OperatingsegmentsAbstract
210 Segment information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
211 2104100 - Disclosure - Other revenues and expenses Network

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 http://www.sequans.com/role/OtherRevenuesAndExpenses
212 Implied Table Table

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213 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
214 Other revenues and expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExpenseExplanatory
215 2105100 - Disclosure - Income tax Network

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 http://www.sequans.com/role/IncomeTax
216 Implied Table Table

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217 Income Taxes [Abstract] Abstract sqns:IncomeTaxesAbstract
218 Income tax Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
219 2106100 - Disclosure - Earnings (loss) per share Network

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 http://www.sequans.com/role/EarningsLossPerShare
220 Implied Table Table

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221 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
222 Earnings (loss) per share Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
223 2107100 - Disclosure - Property, plant and equipment Network

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 http://www.sequans.com/role/PropertyPlantAndEquipment
224 Implied Table Table

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225 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
226 Property, plant and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
227 2108100 - Disclosure - Intangible assets Network

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 http://www.sequans.com/role/IntangibleAssets
228 Implied Table Table

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229 Intangible Assets [Abstract] Abstract sqns:IntangibleAssetsAbstract
230 Intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
231 2109100 - Disclosure - Inventories Network

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 http://www.sequans.com/role/Inventories
232 Implied Table Table

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233 Inventories [Abstract] Abstract sqns:InventoriesAbstract
234 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
235 2110100 - Disclosure - Trade receivables Network

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 http://www.sequans.com/role/TradeReceivables
236 Implied Table Table

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237 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
238 Trade receivables Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
239 2111100 - Disclosure - Cash and cash equivalents Network

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 http://www.sequans.com/role/CashAndCashEquivalents
240 Implied Table Table

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241 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
242 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
243 2112100 - Disclosure - Issued capital and reserves Network

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 http://www.sequans.com/role/IssuedCapitalAndReserves
244 Implied Table Table

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245 Share Capital, Reserves And Other Equity Interest [Abstract] Abstract sqns:ShareCapitalReservesAndOtherEquityInterestAbstract
246 Issued capital and reserves Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
247 2113100 - Disclosure - Share-based payment plans Network

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 http://www.sequans.com/role/ShareBasedPaymentPlans
248 Implied Table Table

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249 Share-Based Payment Arrangements [Abstract] Abstract sqns:ShareBasedPaymentArrangementsAbstract
250 Share-based payment plans Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
251 2114100 - Disclosure - Interest-bearing loans and borrowings Network

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 http://www.sequans.com/role/InterestBearingLoansAndBorrowings
252 Implied Table Table

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253 Financial Instruments [Abstract] Abstract sqns:FinancialInstrumentsAbstract
254 Interest-bearing loans and borrowings Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
255 2115100 - Disclosure - Government grant advances and loans Network

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 http://www.sequans.com/role/GovernmentGrantAdvancesAndLoans
256 Implied Table Table

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257 Government Grants [Abstract] Abstract sqns:GovernmentGrantsAbstract
258 Government grant advances and loans Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGovernmentGrantsExplanatory
259 2116100 - Disclosure - Provisions Network

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 http://www.sequans.com/role/Provisions
260 Implied Table Table

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261 Other Provisions, Contingent Liabilities and Contingent Assets [Abstract] Abstract sqns:OtherProvisionsContingentLiabilitiesandContingentAssetsAbstract
262 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
263 2117100 - Disclosure - Other non-current liabilities Network

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 http://www.sequans.com/role/OtherNonCurrentLiabilities
264 Implied Table Table

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265 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
266 Other non-current liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentLiabilitiesExplanatory
267 2118100 - Disclosure - Trade payables and other current liabilities Network

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 http://www.sequans.com/role/TradePayablesAndOtherCurrentLiabilities
268 Implied Table Table

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269 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
270 Trade payables and other current liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
271 2119100 - Disclosure - Information about financial instruments Network

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 http://www.sequans.com/role/InformationAboutFinancialInstruments
272 Implied Table Table

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273 Financial Instruments [Abstract] Abstract sqns:FinancialInstrumentsAbstract
274 Information about financial instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
275 2120100 - Disclosure - Commitments and contingencies Network

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296 Earnings (loss) per share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
297 Revenue recognition Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
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303 Deferred income tax Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory
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310 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
311 Costs of Public Offerings Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
312 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
313 Share-based payment transactions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
314 Financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory
315 Derivative financial instruments and hedge accounting Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory
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318 Fair value of financial instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory
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323 Schedule of Average and Closing Exchange Rate for the U.S. Dollar Concept (Text Block (HTML)) For Period sqns:DisclosureOfExchangeRateForFunctionalCurrencyTableTextBlock
324 Schedule of Useful Lives Most Commonly Used Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
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333 Schedule of Cost of Revenue and Operating Expenses Concept (Text Block (HTML)) For Period sqns:DisclosureOfCostOfSalesOperatingExpensesAndEmployeeBenefitsExplanatoryTableTextBlock
334 Schedule of Research and Development Expense Concept (Text Block (HTML)) For Period sqns:DisclosureOfResearchAndDevelopmentExpenseExplanatoryTableTextBlock
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360 Schedule of Movements in the Provision for Impairment of Receivables Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
361 Aging Analysis of Trade Receivables That Were Not Impaired Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory
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374 Summary of movement in number and WAEP of founder warrants, warrants and restricted shares awards Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
375 Fair value assumptions for determining value of the grants Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory
376 Fair value assumptions for determining value of the grants Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
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389 Schedule of Main Assumptions Used Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
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402 Disclosure of Financial Liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialLiabilitiesExplanatory
403 Schedule of Present Fair Values of Derivative Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
404 Summary of Customers Representing Company's Total Revenue Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSegmentsMajorCustomersExplanatory
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 http://www.sequans.com/role/SummaryOfSignificantAccountingAndReportingPoliciesScheduleOfAverageAndClosingExchangeRateForUSDollarDetails
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 http://www.sequans.com/role/OtherRevenuesAndExpensesScheduleOfFinancialIncomeAndExpensesDetails
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487 Total financial expenses Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
488 2404403 - Disclosure - Other revenues and expenses - Financial Income and Expenses (Narrative) (Details) Network

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 http://www.sequans.com/role/IncomeTaxScheduleOfMajorComponentsOfIncomeTaxExpenseDetails
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536 2405403 - Disclosure - Income tax - Narrative (Details) Network

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 http://www.sequans.com/role/IncomeTaxNarrativeDetails
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 http://www.sequans.com/role/IncomeTaxReconciliationOfIncomeTaxesComputedAtFrenchStatutoryRateDetails
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 http://www.sequans.com/role/EarningsLossPerShareDetails
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 http://www.sequans.com/role/PropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails
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 http://www.sequans.com/role/PropertyPlantAndEquipmentNarrativeDetails
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 http://www.sequans.com/role/IntangibleAssetsDetails
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 http://www.sequans.com/role/InventoriesScheduleOfInventoriesDetails
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 http://www.sequans.com/role/InventoriesNarrativeDetails
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 http://www.sequans.com/role/TradeReceivablesScheduleOfNonInterestBearingTradeReceivablesDetails
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 http://www.sequans.com/role/TradeReceivablesScheduleOfMovementsInProvisionForImpairmentOfReceivablesDetails
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645 2410404 - Disclosure - Trade receivables - Aging Analysis of Trade Receivables That Were Not Impaired (Details) Network

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 http://www.sequans.com/role/TradeReceivablesAgingAnalysisOfTradeReceivablesThatWereNotImpairedDetails
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 http://www.sequans.com/role/CashAndCashEquivalentsScheduleOfCashAndCashEquivalentsDetails
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 http://www.sequans.com/role/IssuedCapitalAndReservesAuthorizedCapitalInNumberOfSharesDetails
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 http://www.sequans.com/role/IssuedCapitalAndReservesSharesIssuedAndFullyPaidDetails
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 http://www.sequans.com/role/IssuedCapitalAndReservesCapitalTransactionsDetails
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 http://www.sequans.com/role/ShareBasedPaymentPlansNarrativeDetails
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732 2413403 - Disclosure - Share-based payment plans - General employee stock option, founders warrant plans and restricted shares awards (Details) Network

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 http://www.sequans.com/role/ShareBasedPaymentPlansGeneralEmployeeStockOptionFoundersWarrantPlansAndRestrictedSharesAwardsDetails
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 http://www.sequans.com/role/ShareBasedPaymentPlansWarrantPlansForCertainConsultantsConsideredEquivalentToEmployeesDetails
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*

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 http://www.sequans.com/role/ShareBasedPaymentPlansMovementsInNumberAndWaepDetails
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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
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783 WAEP of units exercised during the year (in usd per unit) Concept (Share) For Period sqns:WeightedAverageExercisePriceOfShareOptionsAndOtherEquityInstrumentsExercisedInShareBasedPaymentArrangement
784 WAEP of units expired during the year (in usd per unit) Concept (Share) For Period sqns:WeightedAverageExercisePriceOfShareOptionsAndOtherEquityInstrumentsExpiredInShareBasedPaymentArrangement
785 WAEP of units outstanding at period end (in usd per unit) Concept (Share) As Of sqns:WeightedAverageExercisePriceOfShareOptionsAndOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangement
786 WAEP of units exercisable at period end (in usd per unit) Concept (Share) As Of sqns:WeightedAverageExercisePriceOfShareOptionsAndOtherEquityInstrumentsExercisableInShareBasedPaymentArrangement
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788 2413406 - Disclosure - Share-based payment plans - Movements in number and restricted shares awards (Details) Network

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789 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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790 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
791 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
792 Restricted share awards (RSA) Member sqns:RestrictedShareAwardsRSAMember
793 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
794 Outstanding at January 1, Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
795 Granted during the year Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
796 Forfeited during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
797 Vested during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
798 Outstanding at period end Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
799 2413407 - Disclosure - Share-based payment plans - Valuation assumptions (Details) Network

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 http://www.sequans.com/role/ShareBasedPaymentPlansValuationAssumptionsDetails
800 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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803 Minimum Member ifrs-full:BottomOfRangeMember
804 Maximum Member ifrs-full:TopOfRangeMember
805 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
806 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
807 Stock Options Member sqns:StockOptionsMember
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809 Warrants Member sqns:WarrantsMember
810 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
811 Dividend yield (%) Concept (Percent) For Period sqns:ExpectedDividendAsPercentageShareOptionsAndOtherEquityInstrumentsGranted
812 Expected volatility (%) Concept (Percent) For Period sqns:ExpectedVolatilityShareOptionsAndOtherEquityInstrumentsGranted
813 Risk–free interest rate (%) Concept (Percent) For Period sqns:RiskFreeInterestRateShareOptionsAndOtherEquityInstrumentsGranted
814 Assumed annual lapse rate of awards (%) Concept (Percent) For Period sqns:AssumedAnnualLapseRateShareOptionsGranted
815 Assumed annual lapse rate of RSA (%) Concept (Percent) For Period sqns:AssumedAnnualLapseRateOtherEquityInstrumentsGranted
816 Sell price multiple (applied to exercise price) Concept (Pure) For Period sqns:SellingPriceMultipleShareOptionsAndOtherEquityInstrumentsGranted
817 Weighted average share price (in € per share) Concept (Share) For Period sqns:WeightedAverageSharePriceShareOptionsAndOtherEquityInstrumentsGranted
818 2414402 - Disclosure - Interest-bearing loans and borrowings - Schedule of Interest-Bearing Loans and Borrowings (Details) Network

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819 Disclosure of detailed information about borrowings [table] Table

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821 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
822 Borrowings, Excluding Government Loans And Research Project Financing Member sqns:BorrowingsExcludingGovernmentLoansAndResearchProjectFinancingMember
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824 Finance lease obligation Member sqns:FinanceLeaseLiabilitiesMember
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826 Convertible debt and accrued interest Member sqns:ConvertibleBorrowingsIssuedMember
827 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
828 Interest-bearing financing of receivables Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
829 Total non-current portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
830 2414403 - Disclosure - Interest-bearing loans and borrowings - Convertible Debt (Details) Network

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831 Disclosure of detailed information about borrowings [table] Table

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834 Financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
835 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
836 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
837 Convertible debt embedded derivative Member sqns:EmbeddedDerivativeMember
838 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
839 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
840 Market approach Member ifrs-full:MarketApproachMember
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842 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
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845 2015 convertible notes following term extension Member sqns:ConvertibleBorrowingsIssuedApril2015FollowingTermExtensionMember
846 2016 convertible notes Member sqns:ConvertibleBorrowingsIssuedApril2016Member
847 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
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851 Conversion price (in dollars per share) Concept (Share) As Of sqns:DebtInstrumentConvertibleConversionPrice2
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853 Debt term Concept (xbrli:durationItemType) For Period sqns:BorrowingsMaturityTerm
854 Interest rate used to value liability Concept (Percent) For Period ifrs-full:InterestRateSignificantUnobservableInputsLiabilities
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856 Adjustments for increase (decrease) in derivative financial liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDerivativeFinancialLiabilities
857 Change in the fair value of convertible debt embedded derivative Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
858 Decrease in borrowings Concept (Monetary) For Period Debit sqns:IncreaseDecreaseBorrowings
859 Convertible debt amendments Concept (Monetary) For Period Debit sqns:ConvertibleDebtAmendmentNet
860 Shares issued (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
861 2414404 - Disclosure - Interest-bearing loans and borrowings - Finance Lease Obligation (Details) Network

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862 Disclosure of detailed information about financial instruments [table] Table

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864 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
865 Finance lease obligation Member sqns:FinanceLeaseLiabilitiesMember
866 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
867 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
868 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
869 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
870 Finance lease acquisitions, maximum purchase amount Concept (Monetary) For Period Credit sqns:FinanceLeaseLiabilitiesMaximumAssetPurchaseAmount
871 Finance lease reimbursement period Concept (xbrli:durationItemType) For Period sqns:FinanceLeaseLiabilitiesReimbursementPeriod
872 Finance lease, effective interest rate Concept (Percent) For Period sqns:FinanceLeaseLiabilitiesEffectiveInterestRate
873 Financial assets pledged as collateral, percentage Concept (Percent) For Period sqns:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilitiesPercentageOfPrincipal
874 Financial assets pledged as collateral Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
875 2414405 - Disclosure - Interest-bearing loans and borrowings - Interest-Bearing Financing Receivables (Details) Network

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 http://www.sequans.com/role/InterestBearingLoansAndBorrowingsInterestBearingFinancingReceivablesDetails
876 Disclosure of detailed information about borrowings [table] Table

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877 Continuing involvement in derecognised financial assets by type of transfer [axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis
878 Types of transfer [member] Member ifrs-full:TypesOfTransferMember
879 Factoring of receivables Member ifrs-full:FactoringOfReceivablesMember
880 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
881 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
882 Interest-bearing receivables financing Member sqns:InterestBearingReceivablesFinancingLineOfCreditMember
883 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
884 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
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886 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
887 Available borrowings, percentage of face value of accounts receivable Concept (Percent) For Period sqns:BorrowingsAvailablePercentageOfFaceValueOfDerecognisedAssets
888 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
889 Adjustment to interest rate basis Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
890 Exclusion from past due period of accounts receivable Concept (xbrli:durationItemType) For Period sqns:ExclusionFromBorrowingsPastDuePeriod
891 Current borrowings Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
892 2415402 - Disclosure - Government grant advances and loans - Schedule of Government Grant Advances and Loans (Details) Network

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893 Implied Table Table

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894 Government Grants [Abstract] Abstract sqns:GovernmentGrantsAbstract
895 Current Abstract ifrs-full:MiscellaneousCurrentLiabilitiesAbstract
896 Government grant advances Concept (Monetary) As Of Credit sqns:CurrentGovernmentGrantAdvances
897 Research project financing Concept (Monetary) As Of Credit sqns:CurrentResearchProjectFinancing
898 Government loans Concept (Monetary) As Of Credit sqns:CurrentGovernmentLoans
899 Total current portion Concept (Monetary) As Of Credit ifrs-full:CurrentGovernmentGrants
900 Non-current Abstract ifrs-full:MiscellaneousNoncurrentLiabilitiesAbstract
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902 Research project financing Concept (Monetary) As Of Credit sqns:NonCurrentResearchProjectFinancing
903 Government loans Concept (Monetary) As Of Credit sqns:NonCurrentGovernmentLoans
904 Accrued interest Concept (Monetary) As Of Credit ifrs-full:NoncurrentInterestPayable
905 Total non-current portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentGovernmentGrants
906 2415403 - Disclosure - Government grant advances and loans - Government Grant Advances (Details) Network

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907 Schedule of Research and Development Arrangement, Contract to Perform for Others Table

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911 Maximum Member ifrs-full:TopOfRangeMember
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915 Term of collaborative project Concept (xbrli:durationItemType) For Period sqns:GovernmentGrantAdvancesTermOfProject
916 2415404 - Disclosure - Government grant advances and loans - Research Project Financing (Details) Network

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917 Disclosure of detailed information about borrowings [table] Table

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942 Reduction in debt carrying value Concept (Monetary) For Period Credit sqns:DebtInstrumentIncreaseDecreaseForPeriodNet1
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950 2415405 - Disclosure - Government grant advances and loans - Government Loans (Details) Network

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 http://www.sequans.com/role/GovernmentGrantAdvancesAndLoansGovernmentLoansDetails
951 Disclosure of detailed information about borrowings [table] Table

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962 2416402 - Disclosure - Provisions - Reconciliation of Changes in Provisions (Details) Network

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 http://www.sequans.com/role/ProvisionsReconciliationOfChangesInProvisionsDetails
963 Disclosure of other provisions [table] Table

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969 Reconciliation of changes in other provisions [abstract] Abstract ifrs-full:ReconciliationOfChangesInOtherProvisionsAbstract
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972 Released (used) during the year Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
973 Released (unused) during the year Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
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975 Current Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
976 Non current Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
977 2416403 - Disclosure - Provisions - Narrative (Details) Network

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978 Disclosure of other provisions [table] Table

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984 Actuarial gain (loss) included in comprehensive income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
985 Number of employees retired during the year Concept (Integer) For Period sqns:NumberOfEmployeesRetiredDuringTheYear
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988 Payment of contractual penalty with supplier Concept (Monetary) For Period Credit sqns:PaymentOfContractualPenaltyWithSupplier
989 Increase (decrease) in other provisions Concept (Monetary) For Period Credit ifrs-full:ChangesInOtherProvisions
990 2416404 - Disclosure - Provisions - Schedule of Main Assumptions Used (Details) Network

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1000 Retirement age Concept (Decimal) As Of ifrs-full:ActuarialAssumptionOfRetirementAge
1001 Turnover: depending on the seniority Concept (Percent) As Of sqns:ActuarialAssumptionOfTurnoverFromAgeSixtyFour
1002 2417402 - Disclosure - Other non-current liabilities - Schedule of Other Non-Current Liabilities (Details) Network

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1003 Implied Table Table

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1004 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1005 Payables Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToTradeSuppliers
1006 Deferred tax Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1007 Total other non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
1008 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
1009 2417403 - Disclosure - Other non-current liabilities - Narrative (Details) Network

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1010 Purchase Commitment, Excluding Long-term Commitment1 [Table] Table

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1030 2418402 - Disclosure - Trade payables and other current liabilities - Schedule of Trade Payables and Other Current Liabilities (Details) Network

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1031 Implied Table Table

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1032 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
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1038 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
1039 2418403 - Disclosure - Trade payables and other current liabilities - Narrative (Details) Network

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1040 Purchase Commitment, Excluding Long-term Commitment1 [Table] Table

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1053 2419402 - Disclosure - Information about financial instruments - Schedule of Financial Assets and Financial Liabilities (Details) Network

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1054 Disclosure Of Financial Assets And Liabilities [Table] Table

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 sqns:DisclosureOfFinancialAssetsAndLiabilitiesTable
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1058 Loans and other receivables Member sqns:LoansAndOtherReceivablesMember
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1066 Financial instruments at fair value through profit and loss Member sqns:FinancialLiabilitiesMeasuredAtFairValueThroughProfitAndLossMember
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1069 Trade receivables Member ifrs-full:TradeReceivablesMember
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1075 Convertible debt and accrued expenses Member sqns:ConvertibleBorrowingsIssuedMember
1076 Government loans Member sqns:GovernmentLoansMember
1077 Research project financing Member sqns:ResearchProjectFinancingMember
1078 Trade and other payables (current and non current) Member sqns:TradeAndOtherPayablesMember
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1080 Convertible debt embedded derivative Member sqns:EmbeddedDerivativeMember
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1083 Carrying amount Abstract sqns:FinancialInstrumentsAssetsCarryingAmountAbstract
1084 Total financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1085 Total current Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
1086 Total non-current Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
1087 Fair value Abstract sqns:FinancialInstrumentsAssetsFairValueAbstract
1088 Total financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1089 Total current Concept (Monetary) As Of Debit sqns:CurrentFinancialAssetsAtFairValue
1090 Total non-current Concept (Monetary) As Of Debit sqns:NoncurrentFinancialAssetsAtFairValue
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1092 Carrying amount Abstract sqns:FinancialInstrumentsLiabilitiesCarryingAmountAbstract
1093 Total financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
1094 Total current Concept (Monetary) As Of Credit ifrs-full:CurrentFinancialLiabilities
1095 Total non-current Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinancialLiabilities
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1097 Total financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1098 Total current Concept (Monetary) As Of Credit sqns:CurrentFinancialLiabilitiesAtFairValue
1099 Total non-current Concept (Monetary) As Of Credit sqns:NonCurrentFinancialLiabilitiesAtFairValue
1100 2419403 - Disclosure - Information about financial instruments - Schedule of Assets and Liabilities Measured at Fair Value (Details) Network

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 http://www.sequans.com/role/InformationAboutFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueDetails
1101 Disclosure Of Financial Assets And Liabilities [Table] Table

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*

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1103 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1104 Cash flow hedges Member sqns:DerivativeLiabilitiesMember
1105 Convertible debt embedded derivative Member sqns:EmbeddedDerivativeMember
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1108 Financial instruments at fair value through other comprehensive income Member sqns:FinancialLiabilitiesMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1109 Financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1110 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1111 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1112 Level 1 Member ifrs-full:Level1OfFairValueHierarchyMember
1113 Level 2 Member ifrs-full:Level2OfFairValueHierarchyMember
1114 Level 3 Member ifrs-full:Level3OfFairValueHierarchyMember
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1116 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1117 Available for sale instruments Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
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1119 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1120 Long-term investments Member sqns:LongTermInvestmentsMember
1121 Disclosure Of Financial Assets And Liabilities [Line Items] LineItems sqns:DisclosureOfFinancialAssetsAndLiabilitiesLineItems
1122 Fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1123 Financial liabilities, at fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1124 2419404 - Disclosure - Information about financial instruments - Schedule of Present Fair Values of Derivative Financial Instruments (Details) Network

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 http://www.sequans.com/role/InformationAboutFinancialInstrumentsScheduleOfPresentFairValuesOfDerivativeFinancialInstrumentsDetails
1125 Disclosure of financial liabilities [table] Table

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 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1126 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
1127 Hedges [member] Member ifrs-full:TypesOfHedgesMember
1128 Cash flow hedges Member ifrs-full:CashFlowHedgesMember
1129 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1130 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
1131 Forward contracts Member ifrs-full:ForwardContractMember
1132 Options Member ifrs-full:OptionContractMember
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1135 Financial instruments at fair value through other comprehensive income Member sqns:FinancialLiabilitiesMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1136 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1137 Notional Amount Concept (Decimal) As Of ifrs-full:NominalAmountOfHedgingInstrument
1138 Fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1139 2419405 - Disclosure - Information about financial instruments - Narrative (Details) Network

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*

 http://www.sequans.com/role/InformationAboutFinancialInstrumentsNarrativeDetails
1140 Disclosure of detailed information about financial instruments [table] Table

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*

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1143 Foreign currency risk Member ifrs-full:CurrencyRiskMember
1144 Credit risk Member ifrs-full:CreditRiskMember
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1146 All Currencies1 [Domain] Member sqns:AllCurrencies1Domain
1147 U.S. dollar denominated accounts Member currency:USD
1148 Euro denominated accounts Member currency:EUR
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1150 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1151 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1152 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1153 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1154 Long-term investments Member sqns:LongTermInvestmentsMember
1155 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1156 Net gain (loss) on cash flow hedge Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
1157 Loss transferred from other comprehensive income to the statement of operations Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax
1158 Gain (loss) related to ineffective position of hedging instrument Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectiveness
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1160 Fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1161 Percentage of total revenues Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
1162 Percentage of total cost of sales Concept (Percent) For Period sqns:PercentageOfEntitysCostOfSales
1163 Percentage of operating expenses Concept (Percent) For Period sqns:PercentageOfEntitysOperatingExpense
1164 Reasonably possible change in risk variable, percent Concept (Percent) For Period sqns:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariablePercent
1165 Average rate Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
1166 Impact of change in the corresponding risk variable on operating expenses Concept (Monetary) For Period Debit sqns:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnOperatingExpenses
1167 Number of banks Concept (Integer) For Period sqns:NumberOfBanksForWhichCashAndCashEquivalentsAreHeld
1168 2419406 - Disclosure - Information about financial instruments - Summary of Customers Representing Company's Total Revenue (Details) Network

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*

 http://www.sequans.com/role/InformationAboutFinancialInstrumentsSummaryOfCustomersRepresentingCompanysTotalRevenueDetails
1169 Disclosure of major customers [table] Table

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 ifrs-full:DisclosureOfMajorCustomersTable
1170 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1171 Risks [member] Member ifrs-full:TypesOfRisksMember
1172 Credit risk Member ifrs-full:CreditRiskMember
1173 Major customers [axis] Axis ifrs-full:MajorCustomersAxis
1174 Customers [member] Member ifrs-full:MajorCustomersMember
1175 Customer A Member sqns:CustomerAMember
1176 Customer B Member sqns:CustomerBMember
1177 Customer C Member sqns:CustomerCMember
1178 Customer D Member sqns:CustomerDMember
1179 Customer E Member sqns:CustomerEMember
1180 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1181 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1182 Taiwan Member country:TW
1183 CHINA Member country:CN
1184 Disclosure of major customers [line items] LineItems ifrs-full:DisclosureOfMajorCustomersLineItems
1185 Percentage of entity's revenue Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
1186 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1187 2419407 - Disclosure - Information about financial instruments - Schedule of Liquidity Risk (Details) Network

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*

 http://www.sequans.com/role/InformationAboutFinancialInstrumentsScheduleOfLiquidityRiskDetails
1188 Disclosure of maturity analysis for non-derivative financial liabilities [table] Table

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*

 ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
1189 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1190 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1191 Research project financing Member sqns:ResearchProjectFinancingMember
1192 Interest-bearing receivables financing Member sqns:InterestBearingReceivablesFinancingLineOfCreditMember
1193 Government loans Member sqns:GovernmentLoansMember
1194 Convertible debt and accrued interest Member sqns:ConvertibleBorrowingsIssuedMember
1195 Finance lease liability Member sqns:FinanceLeaseLiabilitiesMember
1196 Trade payables Member sqns:TradeAndOtherPayablesMember
1197 Other financial liabilities Member sqns:OtherFinancialLiabilitiesMember
1198 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1199 Risks [member] Member ifrs-full:TypesOfRisksMember
1200 Liquidity risk Member ifrs-full:LiquidityRiskMember
1201 Maturity [axis] Axis ifrs-full:MaturityAxis
1202 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1203 Within one year Member ifrs-full:NotLaterThanOneYearMember
1204 1 to 2 years Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1205 2 to 3 years Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1206 3 to 4 years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
1207 4 to 5 years Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
1208 More than five years Member ifrs-full:LaterThanFiveYearsMember
1209 Disclosure of maturity analysis for non-derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
1210 Financial liabilities considered in liquidity risk Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1211 2419408 - Disclosure - Information about financial instruments - Changes in Liabilities Arising from Financing Activities (Details) Network

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 http://www.sequans.com/role/InformationAboutFinancialInstrumentsChangesInLiabilitiesArisingFromFinancingActivitiesDetails
1212 Disclosure of reconciliation of liabilities arising from financing activities [table] Table

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*

 ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1213 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1214 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1215 Government grant advances and loans Member sqns:GovernmentGrantAdvancesAndLoansMember
1216 Convertible debt and accrued interest Member sqns:ConvertibleDebtAndAccruedInterestMember
1217 Interest-bearing receivables financing Member sqns:InterestBearingReceivablesFinancingLineOfCreditMember
1218 Disclosure of reconciliation of liabilities arising from financing activities [line items] LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1219 Liabilities arising from financing activities beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1220 Increase (decrease) through financing cash flows Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1221 Increase (decrease) through effect of changes in foreign exchange rates Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
1222 Increase (decrease) through other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
1223 Liabilities arising from financing activities ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1224 2420402 - Disclosure - Commitments and contingencies - Contingencies (Details) Network

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*

 http://www.sequans.com/role/CommitmentsAndContingenciesContingenciesDetails
1225 Disclosure of contingent liabilities [table] Table

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*

 ifrs-full:DisclosureOfContingentLiabilitiesTable
1226 Classes of contingent liabilities [axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
1227 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
1228 2014 tax credit Member ifrs-full:TaxContingentLiabilityMember
1229 Disclosure of contingent liabilities [line items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
1230 Provision for risk Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1231 2420403 - Disclosure - Commitments and contingencies - Bank Guarantee (Details) Network

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*

 http://www.sequans.com/role/CommitmentsAndContingenciesBankGuaranteeDetails
1232 Disclosure of credit risk exposure [table] Table

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*

 ifrs-full:DisclosureOfCreditRiskExposureTable
1233 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1234 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1235 Bank guarantee Member ifrs-full:FinancialGuaranteeContractsMember
1236 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
1237 Term of secured lease payments Concept (xbrli:durationItemType) For Period sqns:ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContractsTermOfSecuredPayments
1238 Bank guarantee issued in favor of owners of new leased office space Concept (Monetary) As Of Credit ifrs-full:ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts
1239 Total value of investments Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
1240 2420404 - Disclosure - Commitments and contingencies - Operating Leases (Details) Network

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*

 http://www.sequans.com/role/CommitmentsAndContingenciesOperatingLeasesDetails
1241 Disclosure of finance lease and operating lease by lessee [table] Table

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*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
1242 Maturity [axis] Axis ifrs-full:MaturityAxis
1243 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1244 Within one year Member ifrs-full:NotLaterThanOneYearMember
1245 After one year but not more than five years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1246 More than five years Member ifrs-full:LaterThanFiveYearsMember
1247 Disclosure of finance lease and operating lease by lessee [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
1248 Total minimum lease payments Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1249 Operating lease expense Concept (Monetary) For Period Debit ifrs-full:MinimumOperatingLeasePayments
1250 2420405 - Disclosure - Commitments and contingencies - Purchase Commitments (Details) Network

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*

 http://www.sequans.com/role/CommitmentsAndContingenciesPurchaseCommitmentsDetails
1251 Disclosure of contingent liabilities [table] Table

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*

 ifrs-full:DisclosureOfContingentLiabilitiesTable
1252 Purchase Commitment, Excluding Long-term Commitment1 [Axis] Axis sqns:PurchaseCommitmentExcludingLongtermCommitment1Axis
1253 Purchase Commitment, Excluding Long-term Commitment1 [Domain] Member sqns:PurchaseCommitmentExcludingLongtermCommitment1Domain
1254 Non-cancelable purchase commitments with third-party manufacturer and suppliers for future deliveries of equipment and components Member sqns:PurchaseCommitment1Member
1255 Disclosure of contingent liabilities [line items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
1256 Purchase commitments Concept (Monetary) As Of Credit sqns:PurchaseCommitmentRemainingMinimumAmountCommitted1
1257 2421402 - Disclosure - Related party disclosures - Narrative (Details) Network

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 http://www.sequans.com/role/RelatedPartyDisclosuresNarrativeDetails
1258 Disclosure of transactions between related parties [table] Table

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 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1259 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1260 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1261 2015 convertible notes Member sqns:ConvertibleBorrowingsIssuedApril2015Member
1262 2016 convertible notes Member sqns:ConvertibleBorrowingsIssuedApril2016Member
1263 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1264 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1265 BPI France Participation – Fonds Large Venture Member sqns:Investor1Member
1266 Alok Sharma, member of the board of directors Member sqns:BoardOfDirectors1Member
1267 Affiliate of Nokomis Capital, L.L.C. Member sqns:AffiliatedEntity1Member
1268 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1269 Share capital of the Company (in excess of) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1270 Services in business development and strategy Concept (Monetary) For Period Debit ifrs-full:ServicesReceivedRelatedPartyTransactions
1271 Notional amount Concept (Monetary) As Of ifrs-full:NotionalAmount
1272 Fair value of convertible note Concept (Monetary) As Of Credit ifrs-full:Borrowings
1273 2421403 - Disclosure - Related party disclosures - Compensation of Key Management Personnel (Details) Network

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 http://www.sequans.com/role/RelatedPartyDisclosuresCompensationOfKeyManagementPersonnelDetails
1274 Implied Table Table

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*

 implied:Table
1275 Related Party [Abstract] Abstract sqns:RelatedPartyAbstract
1276 Fixed and variable wages, social charges and benefits expensed in the year Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1277 Share-based payment expense for the year Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1278 Board members fees to non-executive members Concept (Monetary) For Period Debit sqns:KeyManagementPersonnelCompensationBoardOfDirectorFees
1279 Total compensation expense for key management personnel Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1280 2421404 - Disclosure - Related party disclosures - Directors’ Interests In An Employee Share Incentive Plan (Details) Network

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 http://www.sequans.com/role/RelatedPartyDisclosuresDirectorsInterestsInEmployeeShareIncentivePlanDetails
1281 Disclosure of transactions between related parties [table] Table

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 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1282 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1283 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1284 Warrants Member sqns:WarrantsMember
1285 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1286 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
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1295 Mr. Nottenburg Member sqns:BoardOfDirectors4Member
1296 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1297 Number of warrants authorized (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsGrantedInSharebasedPaymentArrangement
1298 Exercise price (usd per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement
1299 Subscription price (eur per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement
1300 Share-based payment expense Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1301 2422401 - Disclosure - Events after the reporting date (Details) Network

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 http://www.sequans.com/role/EventsAfterReportingDateDetails
1302 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1303 Sale Of Stock [Axis] Axis sqns:SaleOfStockAxis
1304 Sale Of Stock [Domain] Member sqns:SaleOfStockDomain
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1307 Shares from board member Member sqns:PublicStockOfferingSharesFromBoardMemberMember
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1315 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1316 Number of awards granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1317 Ordinary shares issued in connection with a public offering (in shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
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1319 Total offering Concept (Monetary) For Period Debit sqns:GrossProceedsFromIssuingShares
1320 Share issue related cost Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
1321 Public equity offering proceeds, net of transaction costs paid Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares

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