Financial result - Additional Information (Detail) € / shares in Units, € in Millions |
12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2025
EUR (€)
|
Dec. 31, 2024
EUR (€)
€ / shares
|
Dec. 31, 2023
EUR (€)
€ / shares
|
Jun. 30, 2025
€ / shares
|
Jun. 30, 2025
$ / shares
|
Dec. 31, 2024
$ / shares
|
Dec. 31, 2023
$ / shares
|
Dec. 31, 2022
€ / shares
|
Dec. 31, 2022
$ / shares
|
|
| Statements [Line Items] | |||||||||
| Change in fair value of warrant liabilities | € 1.7 | € 17.3 | € 2.1 | ||||||
| Bottom of range [member] | |||||||||
| Statements [Line Items] | |||||||||
| Exercise price of warrants or rights | (per share) | € 0.24 | € 2.64 | $ 0.25 | $ 2.92 | € 2.35 | $ 2.51 | |||
| Top of range [member] | |||||||||
| Statements [Line Items] | |||||||||
| Exercise price of warrants or rights | (per share) | € 0.24 | € 2.64 | € 0 | $ 0 | $ 0.25 | $ 2.92 | |||