v3.26.1
Material Accounting Policies (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Material Accounting Policies [Line Items]        
Incurred net losses € (45,633,780) € (46,064,402) € (42,667,529)  
Cash and cash equivalents 16,022,171 18,375,979 12,767,943 € 16,265,355
Marketable securities € 30,200,000 36,800,000    
Project sponsored period 5 years      
Amortized period 3 years      
Impairment loss      
Impairments or reversals of impairments  
Annualized average share price year 5 years 6 months      
Accrued payment € 3,400,000 6,600,000    
Other assets 2,200,000 4,600,000    
Inventory write-downs € 3,300,000 7,300,000    
Bottom of Range [Member]        
Material Accounting Policies [Line Items]        
Rental contracts fixed period 1 year      
Right-of-use assets, useful lives 4 months      
Top of Range [Member]        
Material Accounting Policies [Line Items]        
Rental contracts fixed period 3 years      
Right-of-use assets, useful lives 55 months      
Options Granted [Member]        
Material Accounting Policies [Line Items]        
Inventory write-downs € 7,300,000      
Options Granted [Member] | Bottom of Range [Member]        
Material Accounting Policies [Line Items]        
Volatility rates 143.00%      
Options Granted [Member] | Top of Range [Member]        
Material Accounting Policies [Line Items]        
Volatility rates 147.00%      
Laboratory Equipment [Member] | Bottom of Range [Member]        
Material Accounting Policies [Line Items]        
Estimated useful lives 3 years      
Laboratory Equipment [Member] | Top of Range [Member]        
Material Accounting Policies [Line Items]        
Estimated useful lives 13 years      
Office Equipment [Member] | Bottom of Range [Member]        
Material Accounting Policies [Line Items]        
Estimated useful lives 1 year      
Office Equipment [Member] | Top of Range [Member]        
Material Accounting Policies [Line Items]        
Estimated useful lives 5 years      
Unused tax losses [member]        
Material Accounting Policies [Line Items]        
Deferred tax assets