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Trade and other receivables - Components (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Advances to suppliers € 638 € 2,356  
Unbilled revenues 616 858  
Trade and other receivables 10,722 16,936  
Trade notes and accounts receivable      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 6,651 9,497  
Trade notes and accounts receivable | Cost      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 14,712 17,780  
Trade notes and accounts receivable | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (8,061) (8,283) € (4,254)
Other receivables | Cost      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 3,406 4,728  
Other receivables | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Financial assets € (589) € (503) € (484)