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Leases (Details)
€ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2019
Dec. 31, 2019
EUR (€)
contract
Nov. 30, 2019
EUR (€)
Leases      
Bank guarantee   € 3,000  
Short term deposits pledged as security   € 1,500  
Number of lease contracts containing termination options | contract   0  
Rostock headquarters building      
Leases      
Lease term 12 years 12 years  
Short term deposits pledged as security     € 1,500
Rental deposits   € 257  
Number of times the lease contract can be extended | contract   2  
Lease contract extension term   6 years  
Rental expense   € 1,400  
Offices in Berlin      
Leases      
Lease term   12 years  
Rental deposits   € 257  
Offices in Boston      
Leases      
Lease term   4 years  
Lease contract extension term   2 years  
Plant and machinery      
Leases      
Lease term   2 years  
Rental deposits   € 191  
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