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

The exercise price of share options granted.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_ExercisePriceShareOptionsGranted2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard
-URIDate 2021-03-24

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

The nominal value per share.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Maximum Term Of Options Granted For Share-Based Payment Arrangement

No definition available.

Name:	nbx_MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement
Namespace Prefix:	nbx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Number Of Ordinary Share Subscribed Per Each OSA

No definition available.

Name:	nbx_NumberOfOrdinaryShareSubscribedPerEachOSA
Namespace Prefix:	nbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Share Price Milestone, Euronext Paris

No definition available.

Name:	nbx_SharePriceMilestoneEuronextParis
Namespace Prefix:	nbx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Continued Service Condition Lifted, Number Of Employees

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementEmployeesWithServiceConditionsLifted
Namespace Prefix:	nbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Employees With Vesting Conditions Accelerated

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementEmployeesWithVestingConditionsAccelerated
Namespace Prefix:	nbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Maximum Percentage Exercised

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementMaximumPercentageExercised
Namespace Prefix:	nbx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Recommended Dose Determination, Minimum Number Of Patients

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementRecommendedDoseDeterminationMinimumNumberOfPatients
Namespace Prefix:	nbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Recommended Dose Determination, Total Number Of Patients Enrolled

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementRecommendedDoseDeterminationTotalNumberOfPatientsEnrolled
Namespace Prefix:	nbx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage

No definition available.

Name:	nbx_VestingRequirementsForShareBasedPaymentArrangementVestingPercentage
Namespace Prefix:	nbx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202104Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202104OrdinaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202104PerformanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	nbx_VestingAxis=nbx_FromFirstYearOfGrantDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_VestingAxis=nbx_FromSecondYearOfGrantDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_VestingAxis=nbx_FromThirdYearOfGrantDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_TranchesAxis=nbx_TrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_TranchesAxis=nbx_TrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_TranchesAxis=nbx_TrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nbx_TranchesAxis=nbx_TrancheFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202106OrdinaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202106PerformanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA202106Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=nbx_OSA2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=nbx_ExecutiveBoardAndEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=nbx_BartVanRhijnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=nbx_AnneJulietteHermantLaurentLevyAndBartVanRhijnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=nbx_MembersOfTheExecutiveBoardAndAlainDostieMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_TitleOfIndividualAxis=nbx_EmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: