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Share-based payment plans - Expense and weighted average narrative (Details) - EUR (€) € / shares in Units, € in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]
Return dividend	0.00%
Expense for equity-settled share-based payment Materialise	€ 266	€ 285	€ 47
Weighted-average fair value of warrants outstanding	€ 3.09	€ 3.12	€ 3.19
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement at end of period	€ 5.08	€ 4.94	€ 5.39
SAR
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense for cash-settled shared-based payment Materialise	€ 0	€ 0	€ 9
Carrying value of liability	0	0	0
Total intrinsic value of the liability for warrants currently exercisable.	€ 0	€ 0	€ 0

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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.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

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The intrinsic value of liabilities arising from share-based transactions for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights). The intrinsic value is the difference between the fair value of the shares to which the counterparty has the (conditional or unconditional) right to subscribe, or which it has the right to receive, and the price (if any) that the counterparty is (or will be) required to pay for those shares. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services, for which the counterparty's right to cash or other assets had vested by the end of the period (for example, vested share appreciation rights).

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The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Types of share-based payment arrangements [domain]]

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The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

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