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Right-of-use assets (Details)
€ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2019
Dec. 31, 2021
EUR (€)
contract
Rostock headquarters building    
Leases    
Lease term 12 years 12 years
Number of times the lease contract can be extended | contract   2
Lease contract extension term   6 years
Rental expense   € 1,400
Rostock headquarters building and Berlin offices    
Leases    
Bank guarantee   3,000
Short term deposits pledged as security   € 2,443
Offices in Berlin    
Leases    
Lease term   12 years
Offices in Boston    
Leases    
Lease term   4 years
Plant and machinery    
Leases    
Lease term   2 years
Rental deposits   € 190
Other equipment    
Leases    
Lease term   4 years
Motor vehicles    
Leases    
Lease term   3 years
Certain motor vehicles and premises | Maximum    
Leases    
Lease term   12 months