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

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard
-URIDate 2025-03-27

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

The increase (decrease) in the fair value measurement of liabilities. [Refer: At fair value [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_IncreaseDecreaseInFairValueMeasurementLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of increase in financial liabilities through additions.

No definition available.

Name:	nyxh_FinancialLiabilitiesAdditions
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of increase in financial liabilities resulting from initial recognition.

No definition available.

Name:	nyxh_FinancialLiabilitiesIncreaseFromInitialRecognition
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of increase (decrease) in financing liabilities through separation of non-closely related embedded derivatives.

No definition available.

Name:	nyxh_FinancingLiabilitiesIncreaseDecreaseThroughSeparationOfNonCloselyRelatedEmbeddedDerivatives
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of increase (decrease) in financing liabilities through transaction costs.

No definition available.

Name:	nyxh_FinancingLiabilitiesIncreaseDecreaseThroughTransactionCosts
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of increase (decrease) in financing liabilities through interest rate adjustments.

No definition available.

Name:	nyxh_FinancingLiabilitiesInterestRateAdjustments
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) in Prepayment Option Due To Fair Value Adjustment

No definition available.

Name:	nyxh_IncreaseDecreaseInPrepaymentOptionDueToFairValueAdjustment
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of prepayment option.

No definition available.

Name:	nyxh_PrepaymentOption
Namespace Prefix:	nyxh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	ifrs-full_BorrowingsByNameAxis=nyxh_LoanFacilityWithEuropeanInvestmentBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nyxh_TrancheAxis=nyxh_FirstTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nyxh_TrancheAxis=nyxh_SecondTrancheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_BorrowingsByNameAxis=nyxh_SyntheticWarrantAgreementWithEuropeanInvestmentBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: