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Trade and other receivables and other assets (Details) - EUR (€)
€ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Non-current    
Other assets-Rental deposits € 1,948 € 1,948
Other assets - Others 150  
Trade and other receivables and other assets non-current 2,098 1,948
Current    
Trade receivables 11,089 12,709
Contract assets 3,557 3,884
Receivables due from shareholders 2,766 2,766
Other assets 6,124 5,846
Trade and other receivables and other assets current 23,536 25,205
Total non-current and current trade and other receivables and other assets 25,634 27,153
Trade receivables and contract assets    
Credit loss rates in relation to the outstanding trade receivables and contract assets    
Financial assets € 18,155 € 18,928
Expected credit loss rate 19.30% 12.30%
Expected credit loss € 3,509 € 2,335
Trade receivables and contract assets | Not past due    
Credit loss rates in relation to the outstanding trade receivables and contract assets    
Financial assets € 9,725 € 11,102
Expected credit loss rate 0.30% 0.30%
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 € 1,084 € 1,113
Expected credit loss rate 1.30% 1.00%
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 € 2,031 € 1,708
Expected credit loss rate 1.60% 1.20%
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 € 5,315 € 5,005
Expected credit loss rate 64.70% 45.40%
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    
VAT receivables € 1,744 € 1,311
Prepaid expenses 2,834 3,481
Receivables from grants 743 € 409
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 1,500  
Bank guarantee 3,000  
Other assets | Berlin Offices    
Non-current    
Other assets-Rental deposits 257  
Other assets | Certain plant and machineries    
Non-current    
Other assets-Rental deposits 191  
Other assets | LPC GmbH    
Credit loss rates in relation to the outstanding trade receivables and contract assets    
Consideration receivable for the sale of LPC 213  
Consideration receivable for the sale of LPC due after one year € 150