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Share-based payment plans - Black-Scholes model (Details)	12 Months Ended
	Dec. 31, 2025 Y € / shares
Share-based payment plans
Return dividend	0.00%
Plan 2023 (Mar 25)
Share-based payment plans
Return dividend	0.00%
Expected volatility	66.00%
Risk-free interest rate	3.06%
Expected life | Y	4.22
Exercise price (in EUR)	€ 7.59
Stock price (in EUR)	5.38
Fair value warrant	€ 2.43
Plan 2023 (Nov 23)
Share-based payment plans
Return dividend	0.00%
Expected volatility	64.00%
Risk-free interest rate	3.19%
Expected life | Y	5.59
Exercise price (in EUR)	€ 5.09
Stock price (in EUR)	5.6
Fair value warrant	€ 3.44
Plan 2023 (Oct 23)
Share-based payment plans
Return dividend	0.00%
Expected volatility	64.00%
Risk-free interest rate	3.50%
Expected life | Y	5.59
Exercise price (in EUR)	€ 4.87
Stock price (in EUR)	5.15
Fair value warrant	€ 3.12
Plan 2015 (Sept 16)
Share-based payment plans
Return dividend	0.00%
Expected volatility	47.00%
Risk-free interest rate	0.24%
Expected life | Y	4.3
Exercise price (in EUR)	€ 6.45
Stock price (in EUR)	6.42
Fair value warrant	€ 2.41
IPO 2015 (Nov)
Share-based payment plans
Return dividend	0.00%
Expected volatility	47.00%
Risk-free interest rate	1.17%
Expected life | Y	5.5
Exercise price (in EUR)	€ 8.81
Stock price (in EUR)	8.08
Fair value warrant	€ 3.3
IPO 2014 (Nov)
Share-based payment plans
Return dividend	0.00%
Expected volatility	50.00%
Risk-free interest rate	1.12%
Expected life | Y	5.5
Exercise price (in EUR)	€ 8.81
Stock price (in EUR)	8.67
Fair value warrant	€ 3.94
IPO 2014 (June)
Share-based payment plans
Return dividend	0.00%
Expected volatility	46.00%
Risk-free interest rate	1.70%
Expected life | Y	5.5
Exercise price (in EUR)	€ 8.81
Stock price (in EUR)	8.81
Fair value warrant	€ 3.83

X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 47
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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2025-01-01
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+ References

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- Definition

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

+ References

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X

- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

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