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Operating expenses - Summary of Depreciation, Amortization and Provision Expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Operating Expenses [Line Items]      
Amortization expense of intangible assets € (45) € (176) € (292)
Amortization expense of tangible assets (1,515) (1,579) (1,478)
Utilization of provisions   145 55
Provision for charges (68) (40) (164)
Reversal of provision for disputes   19  
Total depreciation, amortization and provision expenses (1,628) (1,630) (1,879)
R&D      
Disclosure Of Operating Expenses [Line Items]      
Amortization expense of intangible assets (34) (152) (289)
Amortization expense of tangible assets (1,109) (1,250) (1,208)
Utilization of provisions   145 0
Provision for charges (68) 0 (112)
Reversal of provision for disputes   0  
Total depreciation, amortization and provision expenses (1,211) (1,257) (1,609)
SG&A      
Disclosure Of Operating Expenses [Line Items]      
Amortization expense of intangible assets (10) (23) (3)
Amortization expense of tangible assets (406) (329) (270)
Utilization of provisions   0 55
Provision for charges 0 (40) (52)
Reversal of provision for disputes   19  
Total depreciation, amortization and provision expenses € (416) € (373) € (270)