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Operating Expense - Summary of Employee Expenses and Number of Employees (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2022
EUR (€)
employee
Dec. 31, 2021
EUR (€)
employee
Dec. 31, 2020
EUR (€)
employee
Disclosure Of Operating Expense [Line Items]      
Wages and salaries | € € (12,188) € (10,328) € (13,570)
Social security contributions | € (4,765) (4,775) (5,047)
Adjustments for provisions | € (169) (154) 74
Profit sharing granted to employees | € 0 (628) 0
Other short-term employee benefits | € (245) (470) (1,236)
Employee benefits expense | € € (17,366) € (16,354) € (19,779)
Average number of employees | employee 133 122 193
Number of employees | employee 148 122 130
Research And Development [Member]      
Disclosure Of Operating Expense [Line Items]      
Number of employees | employee 73 55 66
Services Related To Research And Development [Member]      
Disclosure Of Operating Expense [Line Items]      
Number of employees | employee 18 18 16
Administration And Management [Member]      
Disclosure Of Operating Expense [Line Items]      
Number of employees | employee 55 47 43
Marketing And Commercial [Member]      
Disclosure Of Operating Expense [Line Items]      
Number of employees | employee 2 2 5