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Issuance of common stock, additional amount Issuance of Common Stock, Additional Amount Issuance of Common Stock, Additional Amount Other change in equity (in shares) Stock Issued During Period, Shares, Other Number of instalments of vesting of RSUs Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Instalments Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Instalments Capital Increase [Domain] Capital Increase [Domain] Capital Increase [Domain] Peanut Drug Substance Agreement, Fareva La Vallée Peanut Drug Substance Agreement, Fareva La Vallée [Member] Peanut Drug Substance Agreement, Fareva La Vallée Pension retirement obligations Postemployment Retirement Benefits [Member] Leases [Abstract] VIASKIN® Peanut Viaskin Peanut Segment [Member] Viaskin Peanut Segment Decrease Property, Plant And Equipment, Sale or Disposal, Net Property, Plant And Equipment, Sale or Disposal, Net Share-based compensation arrangement by share-based payment award, equity instruments, vested in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Vested in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Vested in Period Total non-current liabilities Liabilities, Noncurrent Currency translation effect Property, Plant And Equipment, Currency Translation Effect, Net Property, Plant And Equipment, Currency Translation Effect, Net Going Concern Going Concern [Policy Text Block] Going concern. 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shares) Weighted average number of ordinary shares, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Antidilutive warrants excluded from computation of earnings per share (in warrants) Antidilutive Warrants Excluded from Computation of EPS, Amount Antidilutive Warrants Excluded from Computation of EPS, Amount Manufacturing and supply agreement, contractual period, renewal option Manufacturing and Supply Agreement, Contractual Period, Renewal Option Manufacturing and Supply Agreement, Contractual Period, Renewal Option Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Non-current contingencies & Employee Benefits Of which non-current Liability, Defined Benefit Plan, Noncurrent Number of warrants outstanding, forfeited during period (in shares) Class Of Warrant Or 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[Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Present value of lease liabilities Operating lease liability Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Share options, outstanding (in shares) Number of stock options outstanding, beginning balance (in shares) Number of stock options outstanding, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Trade Payables and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Other cash flows related to financing activities Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Increase Increase in Property, Plant and Equipment Property, Plant, and Equipment, before Accumulated Depreciation, Addition Actuarial gains and 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Activity, Including Discontinued Operation Service fee PDS Services Agreement, Facility Services Fees PDS Services Agreement, Facility Services Fees Other change in equity Stockholders' Equity, Other Shareholders’ equity : Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Cash Equivalents Cash Equivalent Term Deposits Cash equivalent term deposits. Operating expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Capital increase by employee RSU Capital Increase By Employee RSU [Member] Capital Increase By Employee RSU Prepaid right-of-use-asset Prepaid Right of Use Asset Prepaid Right of Use Asset Prepaid Right of Use Asset SO Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Events after the Close of the Period Subsequent Events [Text Block] Summary of movement in provisions Schedule of Loss Contingencies by Contingency [Table Text Block] Name Forgone Recovery, Individual Name Other contingencies Loss Contingency Accrual [Roll Forward] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization [Roll Forward] Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization [Roll Forward] Statement [Line Items] Statement [Line Items] Total non-current assets Assets, Noncurrent Total Assets Assets Defined Benefit Plan [Table] Defined Benefit Plan [Table] Fareva La Vallée Fareva La Vallée [Member] Fareva La Vallée Summary of share-based payments expenses Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Share-Based Payments Share-Based Payment Arrangement [Text Block] Financial income (expense) Finance Income (Expenses) Financial (Expenses). 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Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Summary of SO activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Net cash used in operating and investing activities Cash Provided by (Used in) Operating and Investing Activities, Including Discontinued Operation Cash Provided by (Used in) Operating and Investing Activities, Including Discontinued Operation Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Equity Transaction [Axis] Equity Transaction [Axis] Equity Transaction Other Current & Non Current Assets Other Assets Disclosure [Text Block] Treasury stock (in shares) Treasury Stock, Common, Shares Operating lease, incentives cost Operating Lease, Incentives, Cost Operating Lease, Incentives, Cost 2027 Purchase Obligation, to be Paid, Year Two Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] DBV Technologies Inc., DBV Technologies Australia Pty Ltd and DBV Pharma SAS DBV Technologies Inc., DBV Technologies Australia Pty Ltd and DBV Pharma SAS [Member] DBV Technologies Inc., DBV Technologies Australia Pty Ltd and DBV Pharma SAS American Depositary Share ADR [Member] Number of children enrolled in study Number of Children Enrolled in Study Number of Children Enrolled in Study Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Trade payables Total Trade Payables Trade payables Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Liquidity contract Liquidity Contract, Non-Current Liquidity Contract, Non-Current Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Credit notes issued by CROs Credit Notes Issued By CROs Credit Notes Issued By CROs (Decrease) increase in trade payables Increase (Decrease) in Accounts Payable, Trade Subsequent Events [Abstract] Executive Committee Executive Committee [Member] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Summary of allocation of personnel expenses by function Schedule of Allocation of Personnel Expenses By Function [Table Text Block] Schedule of Allocation of Personnel Expenses By Function [Table text block] Other current liabilities Total Other Current Liabilities Other current liabilities Other Liabilities, Current Other non-current assets Total Other non-current assets Other Assets, Noncurrent Document Type Document Type Purchase Commitment, Excluding Long-Term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Pension retirement obligations Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Tranches [Axis] Tranches [Axis] Tranches Current contingencies & Employee Benefits Of which current Liability, Defined Benefit Plan, Current Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Research And Development By Expense [Axis] Research And Development By Expense [Axis] Research And Development By Expense Loss before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Operating income Total Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Property, plant, and equipment beginning balance Property, plant, and equipment ending balance Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Other Assets [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Summary of RSU activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Number of stock option outstanding, expired during the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and shareholders' equity Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Total contingencies & Employee Benefits Liability, Defined Benefit Plan All Award Types Award Type [Domain] Net Issuance of warrants Issuance Of Warrants [Member] Issuance Of Warrants Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Research And Development By Expense [Domain] Research And Development By Expense [Domain] Research And Development By Expense [Domain] Number of warrants outstanding, beginning balance (in shares) Number of warrants outstanding, ending balance (in shares) Class of Warrant or Right, Outstanding Current portion Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value Measurement Fair Value Disclosures [Text Block] Current contingencies & Employee Benefits Provision For Liabilities Current Provision for liabilities current. Research tax credit, (Crédit d’Impôt Recherche) payment received - Payment received Research Tax Credit, Payment Received Research tax credit payment received. Operating lease term Lessee, Operating Lease, Term of Contract PEO Name PEO Name Accrued expenses Accrued Liabilities and Other Liabilities Geographical [Axis] Geographical [Axis] Number of warrants outstanding, exercised/released during period (in shares) Class Of Warrant Or Right, Exercised During Period Class Of Warrant Or Right, Exercised During Period Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Other Commitments [Line Items] Other Commitments [Line Items] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Net Cash and cash equivalents at the beginning of the period Net cash and cash equivalents at the end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Treasury shares Stock Issued During Period, Value, Treasury Stock Reissued Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Number of related party transactions Number Of Significant Related Party Transactions Number Of Significant Related Party Transactions Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Expenses related to share-based payments Share-Based Payment Arrangement, Noncash Expense Manufacturing & Supply and Quality Manufacturing & Supply And Quality [Member] Manufacturing & Supply And Quality Total Labor and Related Expense Decrease Property, Plant, and Equipment, before Accumulated Depreciation, Disposition Other receivables Other Receivables, Current Other receivables current. Lease contracts Lessee, Operating Leases [Text Block] Allocation of accumulated net losses Adjustments To Additional Paid In Capital Allocation Of Accumulated Gain Loss Net Adjustments To Additional Paid In Capital Allocation Of Accumulated Gain Loss Net Schedule of foreign exchange derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic net loss per share attributable to shareholders (in dollars per share) Net loss per share attributable to ordinary shareholders, basic (in USD per share) Earnings Per Share, Basic Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Real Estate Real Estate [Member] Issuance of share warrants Adjustments to Additional Paid in Capital, Warrant Issued Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Change in Other non-current assets Proceeds From Sale of (Payments To Acquire) Non-Current Financial Assets Proceeds From Sale of (Payments To Acquire) Non-Current Financial Assets - Adjustment and currency translation effect Research Tax Credit, Adjustment And Currency Translation Effect Research tax credit adjustment and currency translation effect. Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Transfer service fee PDS Services Agreement, Transfer Services Fees PDS Services Agreement, Transfer Services Fees Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Ordinary shares Common Stock [Member] Share-based compensation arrangement by share-based payment award, equity instruments, expired in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Expired In Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments, Expired In Period Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Private investment in Public Equity Private Investment In Public Equity [Member] Private Investment In Public Equity Of which non-current Defined Benefit Plan, Benefit Obligation And Loss Contingency Accrual, Noncurrent Defined Benefit Plan, Benefit Obligation And Loss Contingency Accrual, Noncurrent Equity Transaction [Domain] Equity Transaction [Domain] Equity Transaction [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Other contingencies Other Contingencies [Member] Other Contingencies Total Liabilities and Shareholder's equity Liabilities and Equity Stock-options SO Share-Based Payment Arrangement, Option [Member] Pension obligations Pension Obligations [Member] Pension Obligations Share-based payments Share-Based Payments [Member] Share-Based Payments Segments [Axis] Segments [Axis] (Decrease) increase in other current and non-current liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] No Trading Symbol Flag No Trading Symbol Flag Tabular List, Table Tabular List [Table Text Block] Increases in liabilities Loss Contingency Accrual, Loss (Reversal of Loss) Additional paid-in capital Additional Paid in Capital Schedule of trade payables Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Address, Country Entity Address, Country Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Number of RSU outstanding, forfeited during the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Capital increase, two Capital Increase, Two [Member] Capital Increase, Two Non-current assets Assets, Noncurrent [Abstract] Summary of other current liabilities Other Current Liabilities [Table Text Block] General and administrative expenses General & Administrative expenses General & Administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Sale of stock (in dollars per share) Sale of Stock, Price Per Share Significant Events and Transactions Significant Events And Transactions [Text Block] Significant events and transactions of the period disclsure. Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Capital Increase [Axis] Capital Increase [Axis] Capital Increase Of which current Defined Benefit Plan, Benefit Obligation And Loss Contingency Accrual, Current Defined Benefit Plan, Benefit Obligation And Loss Contingency Accrual, Current Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount VAT Assets Prepaid Taxes Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Foreign exchange SWAP Foreign Exchange Forward [Member] Fareva Amboise Fareva Amboise [Member] Fareva Amboise Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Clinical studies Clinical Studies [Member] Clinical Studies Deposits, pledged securities and other non-current financial assets Deposits, Pledged Securities And Other Non-Current Financial Assets Deposits, Pledged Securities And Other Non-Current Financial Assets Name Measure Name Cash and Cash Equivalent [Table] Cash and Cash Equivalent [Table] Pay vs Performance Disclosure [Line Items] Other Other Noncash Income (Expense) Decrease (increase) in other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Subsidiary or Equity Method Investee, Sale of Stock [Table] Subsidiary or Equity Method Investee, Sale of Stock [Table] Name Trading Arrangement, Individual Name Cash and cash equivalents Total Cash and Cash Equivalents Cash and Cash Equivalent Operating lease expense / (income) Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Treasury shares Proceeds From (Payment For) Treasury Stock Proceeds from repayment of treasury stock Non-qualified derivative Not Designated as Hedging Instrument [Member] Increase Depreciation and amortization Depreciation, Depletion and Amortization Summary of research tax credit Summary of Tax Credit Carryforwards [Table Text Block] Defined Benefit Plan, Funding Status [Axis] Defined Benefit Plan, Funding Status [Axis] Cash and Cash Equivalents Cash and Cash Equivalents Disclosure [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Current assets : Assets, Current [Abstract] Tranches [Domain] Tranches [Domain] Tranches [Domain] Weighted average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Liabilities Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Prefunded warrants Prefunded warrants [Member] Prefunded warrants member Income tax Income Tax Expense (Benefit) Social security contributions Social Security Contributions Social Security Contributions Operating income Other Operating Income and Expense [Text Block] Total contractual commitments Purchase Obligation Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net (decrease) / increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Thereafter Lessee, Operating Lease, Liability, to be Paid, Due after Year Two Lessee, Operating Lease, Liability, to be Paid, Due after Year Two Of which current Loss Contingency, Accrual, Current Schedule of relationship with related parties Schedule Of Compensation Payable To Related Party [Table Text Block] Schedule Of Compensation Payable To Related Party Net loss Net loss for the period Net (loss) Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Certificates of deposit, at carrying value Cash Equivalent, Certificate of Deposit, Carrying Value Statement [Table] Statement [Table] Capital increase, one Capital Increase, One [Member] Capital Increase, One Restatement Determination Date: Restatement Determination Date [Axis] Class of warrant or right, number of securities called by each warrant or right (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Other property, plant and equipment Other assets Property, Plant and Equipment, Other Types [Member] Summary of share-based payments expenses [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Actuarial gains and losses on defined-benefit plans Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of other current & non current assets Schedule of Other Assets [Table Text Block] Significant Events And Transactions [Abstract] Significant events and transactions Of which - Non-current portion Research Tax Credit, Non current Research tax credit, non current. Nature of the business and principles and accounting methods Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]