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Provisions - Additional Information (Details) € in Thousands	6 Months Ended
	Jun. 30, 2025 EUR (€)
Provisions for disputes
Disclosure of other provisions
Provisions	€ 230

X

- 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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X

- Definition

Provision Used And Unused Provision Reversed, Other Provisions

+ References

No definition available.

+ Details

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Namespace Prefix:	nbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: