v3.26.1
Fair value (Details)
6 Months Ended
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
Financial liabilities    
Financial liabilities € 58,111,000 € 40,660,000
Transfer of assets, out of level 1 into level 2 0  
Transfer of assets, out of level 2 into level 1 0  
Transfer of liabilities, out of level 1 into level 2 0  
Transfer of liabilities, out of level 2 into level 1 0  
Carrying value | Level I | Cash and cash equivalents    
Financial Assets    
Financial assets 64,115,000 30,001,000
Carrying value | Level I | Financial assets    
Financial Assets    
Financial assets 33,670,000 18,000,000
Carrying value | Level II | Foreign currency swaps and forwards    
Financial Assets    
Financial assets   4,000
Carrying value | Level III | Loan facility agreement    
Financial liabilities    
Financial liabilities 18,787,000 7,793,000
Carrying value | Level III | Synthetic warrants    
Financial liabilities    
Financial liabilities 7,420,000 1,601,000
Carrying value | Level III | Recoverable cash advances    
Financial liabilities    
Financial liabilities 9,051,000 8,609,000
Carrying value | Level III | Convertible bonds    
Financial liabilities    
Financial liabilities 22,328,000 22,657,000
Carrying value | Level III | Cash Guarantees [member]    
Financial Assets    
Financial assets 507,000 394,000
Carrying value | Level III | Prepayment option    
Financial Assets    
Financial assets 66,000 91,000
Carrying value | Level III | Trade and other receivables    
Financial Assets    
Financial assets 9,149,000 6,184,000
Carrying value | Level III | Other current assets    
Financial Assets    
Financial assets 236,000 165,000
Carrying value | Level I And III [member] | Trade and other liabilities    
Financial liabilities    
Financial liabilities 15,100,000 15,578,000
Fair value | Level I | Cash and cash equivalents    
Financial Assets    
Financial assets 64,115,000 30,001,000
Fair value | Level I | Financial assets    
Financial Assets    
Financial assets € 33,670,000 18,000,000
Fair value | Level II | Foreign currency swaps and forwards    
Financial Assets    
Financial assets   4,000
Fair value | Level III | Historical volatility for shares, measurement input | Synthetic warrants | Binomial Tree    
Financial liabilities    
Duration utilized in determining fair value of liabilities 240  
Significant unobservable input liabilities 65.144  
Fair value | Level III | Historical volatility for shares, measurement input | Synthetic warrants | Binomial Tree | Tranche A    
Financial liabilities    
Percentage of reasonably possible increase in unobservable input liabilities 5.00%  
Percentage of reasonably possible decrease in unobservable input liabilities 5.00%  
Change in fair value measurement due to reasonably possible increase in unobservable input liabilities. € 70,000,000  
Changes in fair value measurement due to reasonably possible decrease in unobservable input liabilities € (81,000,000)  
Fair value | Level III | Historical volatility for shares, measurement input | Synthetic warrants | Binomial Tree | Tranche B    
Financial liabilities    
Percentage of reasonably possible increase in unobservable input liabilities 5.00%  
Percentage of reasonably possible decrease in unobservable input liabilities 5.00%  
Change in fair value measurement due to reasonably possible increase in unobservable input liabilities. € 65,000,000  
Changes in fair value measurement due to reasonably possible decrease in unobservable input liabilities (76,000,000)  
Fair value | Level III | Loan facility agreement    
Financial liabilities    
Financial liabilities 19,537,000 8,165,000
Fair value | Level III | Synthetic warrants    
Financial liabilities    
Financial liabilities 7,420,000 1,601,000
Fair value | Level III | Recoverable cash advances    
Financial liabilities    
Financial liabilities 9,051,000 8,609,000
Fair value | Level III | Convertible bonds    
Financial liabilities    
Financial liabilities € 29,438,000 31,243,000
Fair value | Level III | Convertible bonds | Historical volatility for shares, measurement input | Longstaff-Schwartz Monte Carlo    
Financial liabilities    
Percentage of reasonably possible increase in unobservable input liabilities 0.05%  
Percentage of reasonably possible decrease in unobservable input liabilities 0.05%  
Change in fair value measurement due to reasonably possible increase in unobservable input liabilities. € 800,000  
Changes in fair value measurement due to reasonably possible decrease in unobservable input liabilities € 800,000  
Fair value | Level III | Convertible bonds | Credit spread, measurement input | Longstaff-Schwartz Monte Carlo    
Financial liabilities    
Percentage of reasonably possible increase in unobservable input liabilities 0.01%  
Percentage of reasonably possible decrease in unobservable input liabilities 0.01%  
Change in fair value measurement due to reasonably possible increase in unobservable input liabilities. € 164,000  
Changes in fair value measurement due to reasonably possible decrease in unobservable input liabilities 158,000  
Fair value | Level III | Cash Guarantees [member]    
Financial Assets    
Financial assets 507,000 394,000
Fair value | Level III | Prepayment option    
Financial Assets    
Financial assets 66,000 91,000
Fair value | Level III | Trade and other receivables    
Financial Assets    
Financial assets 9,149,000 6,184,000
Fair value | Level III | Other current assets    
Financial Assets    
Financial assets 236,000 165,000
Fair value | Level I And III [member] | Trade and other liabilities    
Financial liabilities    
Financial liabilities € 15,100,000 € 15,578,000