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Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2023
EUR (€)
segment
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Accounting Policies      
Revenue € 53,758,000 € 67,420,000 € 102,990,000
Residual values 0    
Contract termination provisions in prior year 37,216,000    
Provision for onerous contracts 184,000 1,922,000  
Borrowing costs capitalized € 2,375,000 € 2,291,000 € 2,932,000
Weighted average borrowing costs (as a percent) 5.76% 5.78% 7.17%
Impairment to property, plant and equipment € 1,374,000 € 5,884,000 € 22,810,000
No impairment of goodwill € 0    
Number of operating segment | segment 1    
Number of reportable segment | segment 1    
Minimum      
Accounting Policies      
Estimated risk percentage for not accepting the transfer pricing set up 10.00%    
Maximum      
Accounting Policies      
Estimated risk percentage for not accepting the transfer pricing set up 50.00%    
Product      
Accounting Policies      
Revenue € 11,395,000 € 19,571,000 € 22,706,000