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Financial liabilities - Additional Information (Details) € in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2022 EUR (€) | Jan. 01, 2021 | Jul. 10, 2020 EUR (€) quarterly_installment | Jun. 30, 2020 EUR (€) | Mar. 31, 2019 EUR (€) | Oct. 31, 2018 EUR (€) | Jul. 31, 2018 EUR (€) tranche | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2018 EUR (€) | Oct. 18, 2023 | Oct. 12, 2023 EUR (€) | Jun. 30, 2022
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in loans and conditional advances |  |  |  |  |  |  |  | € 0 | € 150 | € 0 |  |  |  |
Loans repayments |  |  |  |  |  |  |  | 3,075 | 2,971 | 3,642 |  |  |  |
Non-current financial liabilities |  |  |  |  |  |  |  | 45,978 | 45,543 |  |  |  |  |
Interest payable |  |  |  |  |  |  |  |  | € 5,400 |  |  |  |  |
Discount rate used in current estimate of value in use |  |  |  |  |  |  |  |  | 21.30% |  |  |  |  |
Catch-up adjustment to the debt through profit and loss |  |  |  |  |  |  |  |  | € 300 |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |  | 50,902 | 50,565 |  |  |  |  |
Conditional Advances and Loans from Government and Public Authorities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of discounting and accretion |  |  |  |  |  |  |  | € (2,800) | (289) |  |  |  |  |
Top of Range | Fixed Flow Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 16.09% |  |  |  |  |  |
Bottom of Range | Fixed Flow Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 14.95% |  |  |  |  |  |
EIB fixed rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Increase in loans and conditional advances |  |  |  |  | € 14,000 | € 16,000 |  |  |  |  |  |  |  |
Gains (losses) on financial liabilities at fair value through profit or loss |  |  |  |  |  |  |  |  |  | (6,900) |  |  |  |
Financial liabilities, carrying amount immediately after initial application of IFRS 9 |  |  |  |  |  |  |  |  |  | 27,500 |  |  |  |
Financial liabilities, at fair value |  |  |  |  |  |  |  | € 43,100 |  | 34,400 |  |  |  |
Royalties agreement, period | 6 years | 6 years |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest | € 5,400 |  |  |  |  |  |  |  |  |  |  |  | € 5,400 |
Milestone payment | € 20,000 |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Borrowings, cumulative milestone prepayment amount |  |  |  |  |  |  |  |  |  |  |  |  | € 100,000 |
Loans repayments |  |  |  |  |  |  |  | 200 | 800 |  |  |  |  |
Non-current financial liabilities |  |  |  |  |  |  |  | 19,000 | € 19,200 | € 27,500 |  |  |  |
Weighted average cost of capital |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |
Borrowings, interest rate |  |  |  |  | 5.00% | 6.00% |  |  | 21.30% | 21.30% |  |  |  |
Interest expense on borrowings |  |  |  |  |  |  |  | 7,800 |  |  |  |  |  |
Interest repayments |  |  |  |  |  |  |  | 700 |  |  |  |  |  |
Impact of discounting and accretion |  |  |  |  |  |  |  | (2,800) | € 300 |  |  |  |  |
Impact of debt discounting effect |  |  |  |  |  |  |  | 11,300 |  |  |  |  |  |
Increase (decrease) related to adjustments for income forecast projections |  |  |  |  |  |  |  | 14,200 |  |  |  |  |  |
Expected future royalty payments |  |  |  |  |  |  |  | 47,500 | 36,600 | € 32,400 |  |  |  |
Borrowings |  |  |  |  |  |  |  | 100,400 | 89,800 |  |  |  |  |
Estimated royalty payments |  |  |  |  |  |  |  | € 47,500 | € 36,600 |  |  |  |  |
Forecasted sales period |  |  |  |  |  |  |  | 6 years | 6 years |  |  |  |  |
EIB fixed rate loan | Market Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 19.65% |  |  |  |  |  |
EIB fixed rate loan | Janssen |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 21.30% |  |  |  |  |  |
Increase (decrease) related to adjustments for income forecast projections |  |  |  |  |  |  |  | € 14,200 |  |  |  |  |  |
EIB fixed rate loan | Principal and Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | 33,900 | € 33,900 |  |  |  |  |
EIB fixed rate loan | Milestone Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | 19,000 | 19,200 |  |  |  |  |
EIB fixed rate loan | Conditional Advances and Loans from Government and Public Authorities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of discounting and accretion |  |  |  |  |  |  |  | (2,832) | € (285) |  |  |  |  |
EIB fixed rate loan | Top of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | € 40,000 |  |  |  |  |  |  |
Bpifrance “PGE” |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 5,000 |  |  |  |  |  |  |  |  |  |
Increase in loans and conditional advances |  |  | € 5,000 |  |  |  |  |  |  |  |  |  |  |
Loans repayments |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.25% |  |  |  |  |  | 1.36% |  |  |  |  |
Borrowing, initial period bearing no interest |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |
Borrowing, maturity |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |
Percentage of state-guaranteed loan |  |  | 0.90 |  |  |  |  |  |  |  |  |  |  |
Borrowing, subsequent period bearing interest |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Borrowings, guarantee fee |  |  | 1.61% |  |  |  |  |  | 0.25% |  |  |  |  |
Number of quarterly instalments | quarterly_installment |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
HSBC “PGE” |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 5,000 |  |  |  |  |  |  |  |  |  |
Loans repayments |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.31%
Borrowing, initial period bearing no interest |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Borrowing, deferment period |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Borrowings, guarantee fee |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |
Milestones amount paid in advance |  |  |  |  |  |  |  |  | € 800 |  |  |  |  |
HSBC “PGE” | Top of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing, deferment period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
HSBC “PGE” | Bottom of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing, deferment period |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Banque Publique d’Investissement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances, interest rate |  |  |  |  |  |  |  |  |  |  | 1.56% |  |  |
Proceeds from contract liabilities |  |  |  |  |  |  |  |  |  |  | € 500 |  |  |
Advances received |  |  |  |  |  |  |  |  |  |  | € 1,600 |  |  |
Bpifrance |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances, outstanding amount |  |  |  |  |  |  |  | 75 |  |  |  |  |  |
Financial liabilities |  |  |  | € 500 |  |  |  | € 342 |  |  |  |  |  |

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- Definition The amount of advances received representing contract liabilities for performance obligations satisfied at a point in time. [Refer: Contract liabilities; Performance obligations satisfied at point in time [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_g&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The carrying amount of financial liabilities immediately after the initial application of IFRS 9. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 42I -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_42I_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) on financial liabilities at fair value through profit or loss. [Refer: Financial liabilities at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest recognised as a liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of non-current financial liabilities. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The cash outflow to settle borrowings, classified as financing activities. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Adjustment To Debt Financing Related to Estimated Debt Outflows + References No definition available. + Details
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- Definition Advances Received, Interest Rate + References No definition available. + Details
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- Definition Borrowing, Deferment Period + References No definition available. + Details
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- Definition Borrowing, Guarantee Fee + References No definition available. + Details
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- Definition Borrowing, Maturity Term + References No definition available. + Details
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- Definition Borrowing, Maturity Term, Initial Period Bearing No Interest + References No definition available. + Details
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- Definition Borrowing, Maturity Term, Subsequent Period Bearing Interest + References No definition available. + Details
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- Definition Borrowing, Number Of Quarterly Instalments + References No definition available. + Details
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- Definition Borrowing, Percentage Of State-Guaranteed Loan + References No definition available. + Details
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- Definition Borrowings, Cumulative Milestone Prepayment Amount + References No definition available. + Details
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- Definition Borrowings, Milestone Payment Contigency + References No definition available. + Details
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- Definition Borrowings, Weighted Average Cost Of Capital + References No definition available. + Details
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- Definition Catch-up Adjustment, Debt Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Consolidated Forecasted Sales, Period + References No definition available. + Details
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Namespace Prefix: | nbx_
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Period Type: | duration

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- Definition Disclosure Of Detailed Information About Financial Liabilities + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Estimated Royalty Payments + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase Decrease Related To Adjustments For Income Forecast Projections + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Increase (Decrease) Through Impact Of Discounting And Accretion, Liabilities Arising From Financing Activities + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
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- Definition Interest Payable, Payment-In-Kind + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest Repayments + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Milestones Amount Paid In Advance + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number Of Tranches, Borrowings + References No definition available. + Details
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Namespace Prefix: | nbx_
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Balance Type: | na
Period Type: | duration

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- Definition Proceeds From Contract Liabilities + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds From The Repayment of Advances + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Royalties Agreement, Period + References No definition available. + Details
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Namespace Prefix: | nbx_
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Balance Type: | na
Period Type: | duration

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- Definition Royalty Payables + References No definition available. + Details
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Namespace Prefix: | nbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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