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Going Concern (Details)
€ in Thousands
6 Months Ended
Jun. 30, 2023
EUR (€)
Jun. 30, 2022
EUR (€)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of detailed information about borrowings [line items]          
Comprehensive loss € 24,604 € 16,905      
Loss of operations resulting in operating cash outflow (14,487) (15,149)      
Accumulated deficit (164,800)        
Equity (15,222)     € 7,411  
Cash and cash equivalents 14,153 € 33,515   € 35,951 € 17,818
Short term debt obligation € 4,500        
Convertible Loan Agreement with Lifera          
Disclosure of detailed information about borrowings [line items]          
Principal amount | $     $ 30,000,000