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Financial risk management objectives and policies (Details) - EUR (€)
€ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
ECL provision of trade and other receivables (as a percent) 57.00% 47.00%
Trade notes and accounts receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets € 5,627 € 9,497
Trade notes and accounts receivable | Cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 13,133 17,780
Trade notes and accounts receivable | Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (7,506) (8,283)
Other receivables | Cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,865 4,728
Other receivables | Accumulated impairment    
Disclosure of detailed information about financial instruments [line items]    
Financial assets € (682) € (503)