Income taxes - Summary of Reconciliation of Income Tax Benefit / (Expense) And The Accounting Loss (Detail) - EUR (€) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Reconciliation of accounting profit multiplied by applicable tax rates [abstract] | ||||
| Loss before income tax | € (47,240,529) | € (45,277,904) | € (86,168,095) | € (91,316,060) |
| Income tax at statutory income tax rate in the Netherlands (25.8%) | 12,188,056 | 11,681,699 | 22,231,369 | 23,559,543 |
| Effect of tax rates in other countries | (6,852,905) | (6,368,484) | (12,578,517) | (12,922,011) |
| Deferred tax assets recognition effects | (5,667,942) | (5,236,870) | (10,413,454) | (10,536,949) |
| Temporary differences for which no deferred tax assets/liabilities have been recognized | 503,571 | 0 | 821,719 | 0 |
| Non-deductible expenses | (226,331) | (186,549) | (386,955) | (515,860) |
| Transfer Pricing adjustment | 0 | (43,987) | 0 | (43,987) |
| Prior period adjustments | (546,649) | (48,591) | (549,469) | (46,185) |
| Income tax expense | € (602,200) | € (202,782) | € (875,307) | € (505,449) |
| X | ||||||||||
- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Income tax relating to adjustments for transfer pricing. No definition available.
|
| X | ||||||||||
- Definition Recognition effects of deferred tax assets. No definition available.
|
| X | ||||||||||
- Definition Tax effect of expenses not deductible in determining taxable profit (tax loss). No definition available.
|
| X | ||||||||||
- Definition Tax effect of other countries. No definition available.
|
| X | ||||||||||
- Definition Temporary differences for deferred tax assets or liabilities recognized. No definition available.
|