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Non-Current Financial Assets - Summary of Non-Current Financial Assets (Detail) - EUR (€) € in Thousands	Jun. 30, 2019	Dec. 31, 2018
Disclosure of non financial assets.
Non-current financial assets	€ 6,144	€ 6,033
Deposits [member]
Disclosure of non financial assets.
Non-current financial assets	1,363	1,374
Pledged securities [member]
Disclosure of non financial assets.
Non-current financial assets	4,226	4,226
Liquidity contract [member]
Disclosure of non financial assets.
Non-current financial assets	€ 555	€ 432

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- Definition

Disclosure of non financial assets [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
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X

- Definition

The amount of non-current financial assets. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
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- Details

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Period Type:

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- Details

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