The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

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- Definition

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

+ References

No definition available.

+ 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
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard
-URIDate 2025-03-27

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- Definition

Represents the annual cash interest rate of borrowings.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the capitalized interest rate of borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyxh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyxh_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyxh_
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Balance Type:	na
Period Type:	duration

- Definition

The number of warrants granted.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyxh_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Details

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Financial Debt - Financial debt related to loan facility agreement and synthetic warrants agreement (Details) € / shares in Units, € in Thousands	Jun. 17, 2026 EUR (€)	Jun. 12, 2026 shares € / shares	Jul. 26, 2024 EUR (€)	Jul. 03, 2024 EUR (€) shares € / shares
Loan facility agreement with the European Investment Bank (EIB).
Disclosure of detailed information about borrowings
Notional amount				€ 37,500
Loan facility agreement with the European Investment Bank (EIB). \| First tranche
Disclosure of detailed information about borrowings
Notional amount				10,000
Borrowings			€ 10,000
Borrowings annual cash interest rate			5.00%
Borrowings capitalized interest rate			5.00%
Loan facility agreement with the European Investment Bank (EIB). \| Second tranche
Disclosure of detailed information about borrowings
Notional amount				13,750
Borrowings	€ 13,750
Borrowings annual cash interest rate	4.00%
Borrowings capitalized interest rate	4.00%
Loan facility agreement with the European Investment Bank (EIB). \| Third tranche
Disclosure of detailed information about borrowings
Notional amount				€ 13,750
Synthetic warrant
Disclosure of detailed information about borrowings
Warrants and rights outstanding				20 years
Synthetic warrant \| First tranche
Disclosure of detailed information about borrowings
Warrants and rights outstanding				5 years
Number of warrants granted \| shares		2,702,703		468,384
Class of warrant \| € / shares		€ 1.48		€ 8.54
Synthetic warrant \| Second tranche
Disclosure of detailed information about borrowings
Warrants and rights outstanding		5 years
Number of warrants granted \| shares		2,101,492
Class of warrant \| € / shares		€ 2.01