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v3.21.2

Commitments - Additional Information (Detail) | 9 Months Ended
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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