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Trade receivables and other assets (Details) - EUR (€)
€ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Non-current      
Other assets-Rental deposits € 2,923   € 1,867
Other assets-Others 100   100
Trade receivables and contract assets and other assets non-current 3,023   1,967
Current      
Trade receivables, net 25,863   25,656
Contract assets, net 2,741   3,543
Other assets 8,171   8,286
Trade receivables and contract assets and other assets current 36,775   37,485
Total non-current and current trade receivables and contract assets and other assets 39,798   39,452
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Impairment of financial assets 95 € 1,174  
Current value added tax receivables     4,578
Trade receivables and contract assets      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Financial assets € 33,467   € 33,967
Expected credit loss rate 14.50%   14.00%
Expected credit loss € 4,863   € 4,768
Trade receivables and contract assets | Not past due      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Financial assets € 21,768   € 24,185
Expected credit loss rate 0.70%   1.60%
Trade receivables and contract assets | Past due 1-30 days      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Financial assets € 4,117   € 2,228
Expected credit loss rate 2.30%   3.10%
Trade receivables and contract assets | Past due 31-90 days      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Financial assets € 869   € 797
Expected credit loss rate 8.50%   7.70%
Trade receivables and contract assets | Past due more than 90 days      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Financial assets € 6,713   € 6,757
Expected credit loss rate 67.80%   63.00%
Minimum      
Current      
Receivables payment terms 30 days    
Maximum      
Current      
Receivables payment terms 90 days    
Other assets      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Current value added tax receivables € 259   € 226
Prepaid expenses 3,781   4,431
Receivables from exercise of share based payments granted 1,225   1,253
Receivables from COVID 19 bank or credit card transactions 1,260   1,076
Receivables from grants 442   € 442
Other assets | Rostock headquarters building      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Cash deposits provided as security for bank loans 2,250    
Bank guarantee 3,000    
Other assets | Berlin Offices      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Cash deposits provided as security for bank loans 192    
Bank guarantee 257    
Other assets | Plant and other equipment, furniture and fixtures Certain plant and machineries      
Non-current      
Other assets-Rental deposits 285    
Other assets | LPC GmbH      
Credit loss rates in relation to the outstanding trade receivables and contract assets      
Consideration receivable for the sale of LPC € 100