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Related party transactions - Other (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Office space Augsburg, Germany      
Related parties      
Rent expense € 2 € 2 € 2
Use of paintings in administrative building      
Related parties      
Rent expense   2 2
Acquired goods from related parties 2    
Schlosserei und Metallbau Ederer, Dießen      
Related parties      
Acquired goods from related parties 0 7 15
Andreas Schmid Logistik      
Related parties      
Acquired goods from related parties 56 74 43
Suzhou Meimai Fast Manufacturing Technology Co. Ltd      
Related parties      
Revenue from related parties 164 175 244
Dscs Digital Supply Chain Solutions Gmbh      
Related parties      
Revenue from related parties € 13 € 0 € 0
Ownership interest in associate (as a percent) 33.30% 33.30% 33.30%
Simon Franz      
Related parties      
Salary received € 9 € 12 € 3