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Relationships with Related Parties (Details)	Mar. 27, 2025 transaction
Related Party Transactions [Abstract]
Related party transaction, number of transactions	3

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- Definition

Related Party Transaction, Number Of Transactions

+ References

No definition available.

+ Details

Name:	dbvt_RelatedPartyTransactionNumberOfTransactions
Namespace Prefix:	dbvt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration