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Related party transactions - Other (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Office space Augsburg, Germany      
Related parties      
Rent expense € 3 € 2 € 2
Paintings in administrative building      
Related parties      
Rent expense     2
Acquired goods from related parties   2  
Schlosserei und Metallbau Ederer, Dießen      
Related parties      
Acquired goods from related parties 0 0 7
Andreas Schmid Logistik AG, Gersthofen      
Related parties      
Services received from related parties 25 56 74
Suzhou Meimai Fast Manufacturing Technology Co., Ltd, Suzhou      
Related parties      
Revenue from related parties 25 164 175
DSCS Digital Supply Chain Solutions GmbH, Gersthofen      
Related parties      
Revenue from related parties € 0 € 13 € 0
Ownership interest in associate (as a percent) 33.30% 33.30% 33.30%
Michele Neuber      
Related parties      
Services received from related parties € 2 € 2  
Simon Franz      
Related parties      
Services received from related parties   € 9 € 12