Personnel expenses - Summary of Personnel Expenses (Detail) - EUR (€) € in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Statements [Line Items] | |||
| Wages and salaries | € (76,000) | € (62,015) | € (48,994) |
| Total other employee benefits | (12,058) | (9,685) | (6,626) |
| Share-based compensation expense | (15,015) | (17,642) | (20,705) |
| Total | (103,073) | (89,342) | (76,325) |
| Research and development expenses [Member] | |||
| Statements [Line Items] | |||
| Wages and salaries | (60,409) | (48,906) | (37,770) |
| Other employee benefits | (8,840) | (7,364) | (4,802) |
| Share-based compensation expense | (7,538) | (9,587) | (11,972) |
| General and administrative expenses [Member] | |||
| Statements [Line Items] | |||
| Wages and salaries | (15,591) | (13,109) | (11,224) |
| Other employee benefits | (3,218) | (2,321) | (1,824) |
| Share-based compensation expense | € (7,477) | € (8,055) | € (8,733) |