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Operating Expenses - Summary of General and Administrative Expenses (Detail) - EUR (€) € in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of General And Administrative Expense [abstract]
Personnel expenses	€ 15,809	€ 11,379
Fees	5,947	5,322
Depreciation and amortization	426	323
Insurance policies	1,071	726
Corporate communication and travel expenses	422	995
Rental	164	582
Others	1,986	1,808
Total general and administrative expenses	€ 25,825	€ 21,135

X

- Definition

Corporate communication and travel expenses general and administrative expenses.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Depreciation and amortization general and administrative expenses.

+ References

No definition available.

+ Details

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- Definition

Disclosure of general and administrative expense.

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No definition available.

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- Definition

Fees general and administrative expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Insurance policies general and administrative expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Other general and administrative expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Personnel general and administrative expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Rental general and administrative expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense relating to selling, general and administrative activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	debit
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