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Segment information and revenue from contracts with customers - Contract balances (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Segment information and revenue from contracts with customers    
Trade receivables (note 15) € 12,709 € 8,572
Contract assets (note 15) 3,884 2,329
Contract liabilities (note 19.4) € 3,748 € 297