Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	DBV Technologies S.A.
Entity Central Index Key	0001613780
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		54,936,687
Document Quarterly Report	true
Document Transition Report	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Address, Country	FR
Entity Small Business	true
Entity Incorporation, State or Country Code	I0
American Depositary Share [Member]
Document Information [Line Items]
Title of 12(b) Security	American Depositary Shares, each representing one-half of one ordinary share, nominal value €0.10 per share
Trading Symbol	dbvt
Security Exchange Name	NYSE
Ordinary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Ordinary shares, nominal value €0.10 per share
No Trading Symbol Flag	true
Security Exchange Name	NYSE