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Accounting Principles - Geographical split (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Geographical split        
Intangible assets € 48 € 541 € 568 € 770
Property, plant and equipment 5,005 9,125 7,386  
Other noncurrent assets 1,047 10,055 1,668  
Revenue 9,198 17,477 12,179  
France        
Geographical split        
Intangible assets 48 541 568  
Property, plant and equipment 3,664 8,402 6,324  
Other noncurrent assets 1,047 9,958 1,603  
Revenue 69 118 127  
USA        
Geographical split        
Property, plant and equipment 323 724 1,062  
Other noncurrent assets   96 65  
Revenue     (2)  
China        
Geographical split        
Property, plant and equipment 1,018      
Revenue € 9,129 4,610 € 12,054  
Japan        
Geographical split        
Revenue   € 12,750