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Other non-current assets - Summary (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other non-current assets      
Non-current restricted cash € 1,418 € 1,276 € 1,158
Financial assets held at fair value through profit or loss 11,275 6,000 1,754
Other non-current assets 1,399 643 549
Total other non-current assets 14,091 7,919 € 3,461
Belgium      
Other non-current assets      
Non-current restricted cash 900 700  
The Netherlands      
Other non-current assets      
Non-current restricted cash € 500 € 600