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Related party transactions - Other (Details) - EUR (€)
€ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Office space Augsburg, Germany    
Related parties    
Rent expense € 1 € 1
Schlosserei und Metallbau Ederer, Dieen    
Related parties    
Acquired goods from related parties 0 0
Andreas Schmid Logistik AG, Gersthofen    
Related parties    
Services received from related parties   11
Suzhou Meimai Fast Manufacturing Technology Co., Ltd, Suzhou    
Related parties    
Revenue from related parties 5 16
DSCS Digital Supply Chain Solutions GmbH, Gersthofen    
Related parties    
Revenue from related parties € 0 0
Ownership interest in associate (as a percent) 33.30%  
Susanne Ederer-Pausewang , Wife of Chief Executive Officer    
Related parties    
Sales of property and other assets from related parties € 27  
Michele Neuber    
Related parties    
Services received from related parties € 1 € 1