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Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loss Contingency [Abstract] |  |
Accrued contract expenses | $ 0.1 | $ 2.1
Refurbishment reserve reversed | $ 1.8 |

X
- Definition Accrued contract expenses. + References No definition available. + Details
Name: | dbvt_AccruedContractExpenses
Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refurbishment Reserve Reversed + References No definition available. + Details
Name: | dbvt_RefurbishmentReserveReversed
Namespace Prefix: | dbvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LossContingencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration