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Notes to the Consolidated Statements of Operations - Research and development expenses (Details) - Research and development expenses - EUR (€)
€ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Notes to the Consolidated Statements of Operations          
Materials € 5,728 € 6,131 € 9,217 € 23,419  
Personnel (12,533) (7,795) (23,570) (14,849)  
Amortization and depreciation (1,783) (1,106) (3,508) (2,119)  
Patents and fees to register a legal right (1,191) 502 (2,048) (1,354)  
Third-party services (7,081) 4,252 (11,773) 21,053  
Maintenance and lease (1,827) (428) (3,593) (464)  
Other (727) (929) (1,410) (1,270)  
Total € (30,868) € (11,635) (55,118) € (22,422)  
Increase in research and development expenses due to reversal of provision for onerous contracts     € 21,303    
Estimated contract termination provisions         € 25,059