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Customer Accounts Receivable and Other Current Assets - Reconciliation of Research Tax Credit (Detail) - EUR (€) € in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 04, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Trade and other receivables [abstract] |  |  |  |
Opening balance sheet receivable |  | € 7,228 | € 5,702 | € 4,340
+ Other income |  | 9,217 | 7,228 | 5,702
- Payment received |  | (7,341) | (5,702) | (4,322)
- Adjustment | € 900 | 113 |  | (18)
Closing balance sheet receivable |  | € 9,217 | € 7,228 | € 5,702

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- Definition Research tax credit current. + References No definition available. + Details
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Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Research tax credit current adjustment. + References No definition available. + Details
Name: | dbvt_ResearchTaxCreditCurrentAdjustment
Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Research tax credit current other income. + References No definition available. + Details
Name: | dbvt_ResearchTaxCreditCurrentOtherIncome
Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Research tax credit current payment received. + References No definition available. + Details
Name: | dbvt_ResearchTaxCreditCurrentPaymentReceived
Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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