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Fixed Assets - Right-of-use assets and lease liabilities (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
EUR (€)
item
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Fixed Assets      
Balance at the beginning € 43,761 € 32,129  
Additions 4,988 17,244  
Depreciation expense (5,772) (5,053) € (3,901)
Impairment (1,100) (710)  
Foreign currency translation (34) 151  
Balance at the end € 41,843 43,761 32,129
Right of use assets, number of extension option | item 1    
Lessee, operating lease, renewal term 5 years    
Tbingen      
Fixed Assets      
Additions € 2,452    
Number of rental agreements | item 6    
Wiesbaden      
Fixed Assets      
Additions € 510    
Number of rental agreements | item 1    
Land and Buildings      
Fixed Assets      
Balance at the beginning € 41,183 31,547  
Additions 4,788 14,834  
Depreciation expense (5,264) (4,639)  
Impairment (1,100) (710)  
Foreign currency translation (33) 151  
Balance at the end 39,574 41,183 31,547
Vehicles      
Fixed Assets      
Balance at the beginning 275 142  
Additions 200 231  
Depreciation expense (156) (98)  
Balance at the end 319 275 142
Other equipment, furniture and fixtures      
Fixed Assets      
Balance at the beginning 2,303 440  
Additions   2,179  
Depreciation expense (352) (316)  
Balance at the end € 1,950 € 2,303 € 440