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Commitments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021 USD ($)
Disclosure Of Commitments [Line Items]
Increase (decrease) in other commitments during the period	$ 0

X

- Definition

Disclosure Of Commitments Line Items.

+ References

No definition available.

+ Details

Name:	dbvt_DisclosureOfCommitmentsLineItems
Namespace Prefix:	dbvt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase (decrease) in other commitments during the period.

+ References

No definition available.

+ Details

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