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Non-Current Financial Assets - Additional Information (Detail) | Dec. 31, 2017 shares
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Disclosure of non financial assets. |
Number of shares outstanding | 24,990,822
Liquidity contract [member] |
Disclosure of non financial assets. |
Number of treasury shares | 4,939

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- Definition Disclosure of non financial assets [Line Items] + References No definition available. + Details
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Namespace Prefix: | dbvt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of treasury shares. + References No definition available. + Details
Name: | dbvt_NumberOfTreasuryShares
Namespace Prefix: | dbvt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |