Financial result - Additional Information (Detail) € / shares in Units, € in Millions |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Jun. 30, 2025
EUR (€)
€ / shares
|
Jun. 30, 2025
EUR (€)
€ / shares
|
Jun. 30, 2025
$ / shares
|
Mar. 31, 2025
€ / shares
|
Mar. 31, 2025
$ / shares
|
Dec. 31, 2024
€ / shares
|
Dec. 31, 2024
$ / shares
|
|
| Statements [Line Items] | |||||||
| Change in fair value of warrant liabilities | € 0.1 | € 1.7 | |||||
| Bottom of range [member] | |||||||
| Statements [Line Items] | |||||||
| Exercise price of warrants or rights | (per share) | € 0.02 | $ 0.02 | € 0.24 | $ 0.25 | |||
| Top of range [member] | |||||||
| Statements [Line Items] | |||||||
| Exercise price of warrants or rights | (per share) | € 0 | € 0 | $ 0 | ||||