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Significant Events in the Reporting Period - Additional Information (Detail) € / shares in Units, € in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 09, 2026 EUR (€) | Mar. 31, 2026 EUR (€) € / shares shares | Mar. 31, 2025 EUR (€) | Mar. 31, 2026 kr / shares | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€)
Significant Events In The Reporting Period LineItems |  |  |  |  |  |
Payment for repurchase of shares |  | € 60,000 |  |  |  |
Nominal value per share | kr / shares |  |  |  | kr 1 |  |
Equity |  | 487,973 | € (189,807) |  | € (162,821) | € (105,706)
Tax losses carryforwards |  | € 1,954,600 |  |  |  |
Share repurchase program authorized amount | € 120,000 |  |  |  |  |
Number of Ordinary Shares Repurchased | shares |  | 254,027 |  |  |  |
Average price per share | € / shares |  | € 236.35 |  |  |  |
Stock repurchase programe remaining amount |  | € 60,000 |  |  |  |
Research and development expense |  | 59,044 | € 86,603 |  |  |
Marketing Approval [Member] |  |  |  |  |  |
Significant Events In The Reporting Period LineItems |  |  |  |  |  |
Research and development expense |  | € 10,900 |  |  |  |
Share Repuchase Program [member] | American depository shares [member] |  |  |  |  |  |
Significant Events In The Reporting Period LineItems |  |  |  |  |  |
Shares authorized to repurchase | shares |  | 2,471,988 |  |  |  |

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