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Notes to the Consolidated Statements of Financial Position (Details)
€ / shares in Units, $ / shares in Units, $ in Millions
 12 Months Ended
Jul. 08, 2023
USD ($)
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
EUR (€)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
EUR (€)
Dec. 31, 2017
EUR (€)
Apr. 30, 2023
€ / shares
shares
Apr. 30, 2023
$ / shares
shares
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Research and development expenses   € 858   € 858   € 10,192      
General and administrative expense   95,205   97,413   105,790      
Cash outflow for leases   0.4   € 0.4   € 0.4      
Inventory write-downs   € 500,000              
Corporate Income Tax   15.00% 15.00% 15.00% 15.00% 15.00%      
Solidarity surcharge   0.80% 0.80% 0.80% 0.80% 0.80%      
Trade taxes   13.065% 13.065% 13.70% 13.70% 12.80%      
Average total tax rate       29.50% 29.50% 28.60%      
Total tax rate   25.74% 25.74% 25.74% 25.74% 25.74%      
Federal tax   21.00% 21.00% 21.00% 21.00% 21.00%      
State tax   4.74% 4.74% 4.74% 4.74% 4.74%      
Total tax loss carryforwards   € 243,800,000   € 211,300,000          
Unused tax losses carried forward   196,000,000   163,400,000          
Corporate income and trade tax   164,000,000   131,600,000          
Tax losses             € 34,800,000    
Tax loss carryforwards   € 12,970,000 $ 14.3 13,200,000 $ 14.1        
Taxable income   80.00% 80.00%            
Current income tax receivable   € 1,390,280   791,344          
Current and non-current financial assets   85.5   68,500,000          
Financial assets from government grants amount                
Due amount       € 6,200,000          
Capital ordinary shares issued (in Shares) | shares   58,883,272   44,703,763          
Nominal value per share | (per share)   € 0.12           € 0.12 $ 4.25
Common shares over time (in Dollars) | $     $ 50.0            
Ordinary shares issued (in Shares) | shares   120,257 120,257            
Common shares issued       € 11,800,000          
Sales agreement amounts (in Dollars) | $ $ 19.0       $ 35.2        
Net proceeds   € 14,400,000 $ 15.7            
Aggregate ordinary shares sold (in Shares) | shares               10,823,529 10,823,529
share sold (in Shares) | shares               1,411,764 1,411,764
Proceeds offering cost   2,500,000 2.8            
Underwriting Discounts   39,100,000 43.2            
Other offering expenses   400,000              
Net proceeds from offering   38,700,000              
Ordinary share purchase   € 2,300,000 $ 2.5            
Price per share (in Dollars per share) | $ / shares     $ 5            
Sale of additional shares (in Shares) | shares   500,000 500,000            
Aggregate purchase price (in Dollars) | $     $ 7.5            
Aggregate public offering (in Dollars) | $     $ 250.0            
Nominal value (in Euro per share) | € / shares   € 0.12              
Ordinary shares (in Shares) | shares   98,754              
Ordinary shares sold at price (in Dollars per share) | $ / shares     $ 1.85            
Ordinary shares (in Shares) | shares   21,503              
Price sold (in Dollars per share) | $ / shares     $ 3.35            
Ordinary share purchase (in Shares) | shares   110,000,000              
Preferred shares (in Shares) | shares   110,000,000              
Nominal value per shares   € 0.12              
Company issued capital   100.00% 100.00%            
Reimburse expenses   € 70,000              
Common shares in excess of nominal value (in Euro per share) | € / shares   € 0.12              
Payments for accrued liabilities   € 2,700,000              
Variables held constant, percentage   10.00% 10.00%            
Credit risk   € 99,300,000   84,000,000          
cash and cash equivalents   12,800,000   € 16,300,000          
Cash received   € 8,800,000              
Minimum [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Nominal fixed interest   0.30% 0.30% 0.00% 0.00%        
Maximum [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Nominal fixed interest   4.125% 4.125% 4.125% 4.125%        
Top of Range [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Foreign exchange on translation   € 1,000,000              
Exchange rate fluctuations (in Euro per share) | € / shares   € 1.2155              
Bottom of Range [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Foreign exchange on translation   € 1,000,000              
Exchange rate fluctuations (in Euro per share) | € / shares   € 0.9945              
Market Program [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Ordinary shares issued (in Shares) | shares   3,235,723 3,235,723 2,568,208 2,568,208        
Stock Option [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Ordinary shares issued (in Shares) | shares   14,930 14,930            
Credit Risk [Member]                  
Notes to the Consolidated Statements of Financial Position (Details) [Line Items]                  
Financial assets   € 86,600,000   € 67,700,000