v3.26.1
Notes to the Consolidated Statements of Financial Position (Details)
€ / shares in Units, $ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2025
EUR (€)
€ / shares
shares
Feb. 28, 2025
€ / shares
$ / shares
shares
Jun. 30, 2023
USD ($)
Jul. 08, 2020
EUR (€)
Feb. 28, 2025
€ / shares
shares
Dec. 31, 2025
EUR (€)
€ / shares
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
€ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2017
EUR (€)
Feb. 28, 2025
$ / shares
shares
Apr. 30, 2023
€ / shares
shares
Apr. 30, 2023
$ / shares
shares
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Research and development expenses             € 785   € 858              
General and administrative expense           15,963   41,400   95,205              
Cash outflow for leases           400,000   400,000   400,000              
Inventory amounted           0   6,900,000                  
Inventory write-downs           300,000   300,000   500,000              
Reversal of inventory write-down           7,100,000   2,700,000   € 0              
Prepayments on research and development           2,222,380   4,628,878                  
Research allowances           2,500,000   € 5,100,000                  
Payment Received           5,200,000                      
Additional receivables recognized           € 2,500,000                      
Corporate income tax           15.00% 15.00% 15.00% 15.00% 15.00% 15.00%            
Solidarity surcharge           0.80% 0.80% 0.80% 0.80% 0.80% 0.80%            
Trade taxes           13.171% 13.171% 13.202% 13.202% 13.065% 13.065%            
Average total tax rate           29.03% 29.03% 29.03% 29.03% 28.99% 28.99%            
Taxable remuneration           25.00% 25.00%                    
Average tax rate           25.74%   25.74%   25.74% 25.74%            
Federal tax           21.00% 21.00% 21.00% 21.00% 21.00% 21.00%            
State tax           4.74% 4.74% 4.74% 4.74% 4.74% 4.74%            
Total tax loss carryforwards           € 324,510,000   € 288,950,000                  
Unused tax losses carried forward           257,700,000   238,400,000                  
Corporate income and trade tax           256,400,000   206,700,000                  
Tax losses                           € 34,800,000      
Tax loss carryforwards           € 21,810,000 $ 25,630 15,750,000 $ 16,360                
Taxable income           80.00% 80.00%                    
Current income tax receivable           € 1,084,053   1,281,649                  
Pre-funded warrants (in Shares) | shares         6,750,000                        
Fair value of the warrants           5,800,000                      
Current and non-current financial assets           33,500,000   37,600,000                  
Trade and other payables           € 5,608,204   € 11,549,150                  
Capital ordinary shares issued (in Shares) | shares           72,292,859   59,351,710                  
Common shares over time       € 50,000,000                          
Net proceeds               € 800,000   € 26,200,000              
Aggregate ordinary shares (in Shares) | shares 8,250,000 8,250,000     8,250,000                   8,250,000    
share sold (in Shares) | shares                               1,411,764 1,411,764
Proceeds offering cost               38,700,000                  
Stock options (in Shares) | shares                   105,327 105,327            
Nominal value (in Euro per share) | € / shares                       € 0.12          
Ordinary shares (in Shares) | shares                       98,754 98,754        
Ordinary shares sold at price (in Dollars per share) | $ / shares                     $ 1.85            
Sold at a price of per share (in Dollars per share) | $ / shares                     $ 3.35            
Aggregate public offering (in Dollars) | $     $ 250,000                            
Ordinary share purchase (in Dollars) | $                         $ 75,000        
Common shares issued (in Shares) | shares           4,691,149                      
Sales agreement amounts (in Dollars) | $             $ 8,000                    
Sales agreement (in Dollars) | $             $ 65,700                    
Purchase of Pre-Funded Warrants (in Shares) | shares 6,750,000                                
Warrant price per share (in Dollars per share) | $ / shares                             $ 0.001    
Gross proceeds offering € 30,000,000                                
Ordinary share purchase (in Shares) | shares 169,300,000 169,300,000     169,300,000                   169,300,000    
Preferred shares (in Shares) | shares 169,300,000 169,300,000     169,300,000                   169,300,000    
Preferred shares with a nominal value (in Euro per share) | € / shares           € 0.12                      
Company issued capital           100.00% 100.00%                    
Reimburse expenses           € 60,000                      
Common shares in excess of nominal value (in Euro per share) | € / shares           € 0.12                      
Variables held constant, percentage           10.00% 10.00%                    
Credit risk           € 46,700,000   61,000,000                  
Cash and cash equivalents           16,000,000   18,400,000                  
Financial assets           30,700,000   42,600,000                  
Level 1 [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Current and non-current financial assets               42,600,000                  
Cost of Sales [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Inventory write-downs           € 100,000   € 300,000   € 0              
Ordinary Shares [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Nominal value per share (in Euro per share) | € / shares € 0.12 € 0.12     € 0.12 € 0.12                   € 0.12  
Aggregate ordinary shares (in Shares) | shares                               10,823,529 10,823,529
ordinary shares price (in Dollars per share) | $ / shares                                 $ 4.25
Ordinary shares sold at price (in Dollars per share) | $ / shares   € 2                              
Ordinary shares (in Shares) | shares               468,438   21,503 21,503            
Top of Range [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Corporate tax rate           15.00% 15.00%                    
Current and non-current financial assets           € 30,700,000                      
Trade and other payables           € 5,600,000                      
Nominal fixed interest           5.20% 5.20% 6.25% 6.25%                
Foreign exchange on translation           € 4,000,000                      
Exchange rate fluctuations (in Euro per share) | € / shares           € 1.2925                      
Bottom of Range [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Corporate tax rate           10.00% 10.00%                    
Current and non-current financial assets           € 6,900,000                      
Trade and other payables           € 5,900,000                      
Nominal fixed interest           0.25% 0.25% 0.30% 0.30%                
Foreign exchange on translation           € 3,300,000                      
Exchange rate fluctuations (in Euro per share) | € / shares           € 1.0575                      
Market Program [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Ordinary shares issued (in Shares) | shares                   3,235,723 3,235,723            
Stock Option [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Ordinary shares issued (in Shares) | shares                   5,803,931 5,803,931            
Stock Options [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Ordinary shares issued (in Shares) | shares                   120,257 120,257            
Stock options (in Shares) | shares                         14,930        
Ordinary Shares [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Net proceeds                   € 14,400,000 $ 15,700            
Research and Developments Expense [Member]                                  
Notes to the Consolidated Statements of Financial Position [Line Items]                                  
Prepayments on research and development           € 2,200,000   € 4,600,000