General and administrative expenses - Breakdown of General and Administrative Expenses (Detail) - EUR (€) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Disclosure Of Detailed Information General And Administrative Expenses [Abstract] | ||||
| Personnel | € (7,503,343) | € (5,775,619) | € (13,750,840) | € (10,804,858) |
| Professional fees | (3,281,897) | (1,686,774) | (6,855,363) | (4,290,920) |
| Insurance, facilities and office | (1,705,557) | (1,389,322) | (3,025,469) | (2,740,083) |
| Accounting, tax and auditing fees | (541,938) | (743,906) | (1,121,973) | (1,361,229) |
| Travel | (469,521) | (274,070) | (726,558) | (599,201) |
| Consulting fees | 0 | (28,497) | 0 | (76,065) |
| Other | (2,285,863) | (867,001) | (4,418,755) | (2,164,751) |
| Total | € (15,788,119) | € (10,765,189) | € (29,898,958) | € (22,037,107) |