Number of shares entitled.

No definition available.

Name:	dbvt_NumberOfSharesEntitled
Namespace Prefix:	dbvt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Performance conditions.

+ References

No definition available.

+ Details

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

- Definition

Share Based Payment Arrangement Fair Value Per Share Granted

+ References

No definition available.

+ Details

Name:	dbvt_ShareBasedPaymentArrangementFairValuePerShareGranted
Namespace Prefix:	dbvt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based payment arrangement options granted discount rate.

+ References

No definition available.

+ Details

Name:	dbvt_ShareBasedPaymentArrangementOptionsGrantedDiscountRate
Namespace Prefix:	dbvt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based payment arrangement plan expiration period.

+ References

No definition available.

+ Details

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

- Definition

Share based payment arrangement share options vesting period.

+ References

No definition available.

+ Details

Name:	dbvt_ShareBasedPaymentArrangementShareOptionsVestingPeriod
Namespace Prefix:	dbvt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The option life of share options granted.

+ References

+ Details

Name:	ifrs-full_DescriptionOfOptionLifeShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

+ Details

Name:	ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=dbvt_BSATwoThousandTenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_ZeroPointNineYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_OnePointNineYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_TwoPointNineYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_ThreePointNineYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_ZeroPointFiveYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_TwoPointFiveYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=dbvt_ThreePointFiveYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share-Based Payments - Summary of Details of Share Based Payment Arrangement BSA 2010 (Detail)				12 Months Ended
	Nov. 22, 2011 EUR (€) € / shares shares	Jun. 24, 2011 EUR (€) € / shares shares	Jan. 28, 2011 EUR (€) € / shares shares	Dec. 31, 2017	Dec. 15, 2017	Dec. 05, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items]
Plan expiration date					12/15/2027	12/05/2027
Number of options granted					8,300	625,200
BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)		1 year 6 months
Plan expiration date		Nov. 22, 2021
Number of options granted		2,000		0			0	0
Share entitlement per BSA \| shares		15
Exercise price (in euros)		77
Grant date share fair value (in euros) \| €		€ 77
Expected volatility		40.00%
Average life of BSA (in years)		0
Discount rate		2.68%
Expected dividends		0.00%
Performance conditions		NA
Fair value per BSA (in euros) \| € / shares		€ 32.70
Not Later Than One Year [member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)	1 year
Plan expiration date	Nov. 22, 2021
Number of options granted	335
Share entitlement per BSA \| shares	15
Exercise price (in euros)	77
Grant date share fair value (in euros) \| €	€ 77
Expected volatility	40.00%
Average life of BSA (in years)	0
Discount rate	2.23%
Expected dividends	0.00%
Fair value per BSA (in euros) \| € / shares	€ 30.70
Later Than One Year and Not Later Than Two Years [member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)	2 years
Plan expiration date	Nov. 22, 2021
Number of options granted	335
Share entitlement per BSA \| shares	15
Exercise price (in euros)	77
Grant date share fair value (in euros) \| €	€ 77
Expected volatility	40.00%
Average life of BSA (in years)	0
Discount rate	2.60%
Expected dividends	0.00%
Fair value per BSA (in euros) \| € / shares	€ 32.58
Later Than Two Years and Not Later Than Three Years [member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)	3 years
Plan expiration date	Nov. 22, 2021
Number of options granted	334
Share entitlement per BSA \| shares	15
Exercise price (in euros)	77
Grant date share fair value (in euros) \| €	€ 77
Expected volatility	40.00%
Average life of BSA (in years)	0
Discount rate	2.60%
Expected dividends	0.00%
Fair value per BSA (in euros) \| € / shares	€ 33.89
Later Than Three Years and Not Later Than Four Years [member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)	4 years
Plan expiration date	Nov. 22, 2021
Number of options granted	334
Share entitlement per BSA \| shares	15
Exercise price (in euros)	77
Grant date share fair value (in euros) \| €	€ 77
Expected volatility	40.00%
Average life of BSA (in years)	0
Discount rate	2.85%
Expected dividends	0.00%
Fair value per BSA (in euros) \| € / shares	€ 35.54
Zero Point Nine Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)			10 months 25 days
Plan expiration date			Jan. 27, 2021
Number of options granted			2,510
Share entitlement per BSA \| shares			15
Exercise price (in euros)			77
Grant date share fair value (in euros) \| €			€ 77
Expected volatility			40.00%
Average life of BSA (in years)			0
Discount rate			2.70%
Expected dividends			0.00%
Performance conditions			NA
Fair value per BSA (in euros) \| € / shares			€ 31.33
One Point Nine Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)			1 year 10 months 25 days
Plan expiration date			Jan. 27, 2021
Number of options granted			2,510
Share entitlement per BSA \| shares			15
Exercise price (in euros)			77
Grant date share fair value (in euros) \| €			€ 77
Expected volatility			40.00%
Average life of BSA (in years)			0
Discount rate			2.82%
Expected dividends			0.00%
Performance conditions			NA
Fair value per BSA (in euros) \| € / shares			€ 32.90
Two point Nine Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)			2 years 10 months 25 days
Plan expiration date			Jan. 27, 2021
Number of options granted			2,510
Share entitlement per BSA \| shares			15
Exercise price (in euros)			77
Grant date share fair value (in euros) \| €			€ 77
Expected volatility			40.00%
Average life of BSA (in years)			0
Discount rate			2.82%
Expected dividends			0.00%
Performance conditions			NA
Fair value per BSA (in euros) \| € / shares			€ 34.23
Three Point Nine Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)			3 years 10 months 25 days
Plan expiration date			Jan. 27, 2021
Number of options granted			2,509
Share entitlement per BSA \| shares			15
Exercise price (in euros)			77
Grant date share fair value (in euros) \| €			€ 77
Expected volatility			40.00%
Average life of BSA (in years)			0
Discount rate			3.04%
Expected dividends			0.00%
Performance conditions			NA
Fair value per BSA (in euros) \| € / shares			€ 35.84
Zero Point Five Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)		6 months
Plan expiration date		Nov. 22, 2021
Number of options granted		2,000
Share entitlement per BSA \| shares		15
Exercise price (in euros)		77
Grant date share fair value (in euros) \| €		€ 77
Expected volatility		40.00%
Average life of BSA (in years)		0
Discount rate		2.55%
Expected dividends		0.00%
Performance conditions		NA
Fair value per BSA (in euros) \| € / shares		€ 31.15
Two Point Five Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)		2 years 6 months
Plan expiration date		Nov. 22, 2021
Number of options granted		2,000
Share entitlement per BSA \| shares		15
Exercise price (in euros)		77
Grant date share fair value (in euros) \| €		€ 77
Expected volatility		40.00%
Average life of BSA (in years)		0
Discount rate		2.68%
Expected dividends		0.00%
Performance conditions		NA
Fair value per BSA (in euros) \| € / shares		€ 34.02
Three point Five Year [Member] \| BSA2010 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period (years)		3 years 6 months
Plan expiration date		Nov. 22, 2021
Number of options granted		2,000
Share entitlement per BSA \| shares		15
Exercise price (in euros)		77
Grant date share fair value (in euros) \| €		€ 77
Expected volatility		40.00%
Average life of BSA (in years)		0
Discount rate		2.87%
Expected dividends		0.00%
Performance conditions		NA
Fair value per BSA (in euros) \| € / shares		€ 35.57