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Supplier Accounts Receivable and Other Current Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 EUR (€)
Disclosure Of Supplier Accounts And Other Current Liabilities [Abstract]
Supplier accounts payable and related payables	€ 0
Supplier accounts and related payables term	1 year

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- Definition

Disclosure of supplier accounts and other current liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	dbvt_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Supplier accounts and related payables term.

+ References

No definition available.

+ Details

Name:	dbvt_SupplierAccountsAndRelatedPayablesTerm
Namespace Prefix:	dbvt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Supplier accounts payable and related payables.

+ References

No definition available.

+ Details

Name:	dbvt_SupplierAccountsPayableAndRelatedPayables
Namespace Prefix:	dbvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant