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Segment information - Revenue by geographical area (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenue by geographical area |  |  |
Revenue | € 267,633 | € 266,765 | € 256,127
United States of America |  |  |
Revenue by geographical area |  |  |
Revenue | 110,886 | 108,584 | 90,350
Americas other than USA |  |  |
Revenue by geographical area |  |  |
Revenue | 6,245 | 6,516 | 7,049
Belgium |  |  |
Revenue by geographical area |  |  |
Revenue | 6,157 | 6,564 | 8,265
Germany |  |  |
Revenue by geographical area |  |  |
Revenue | 30,885 | 34,963 | 33,172
France |  |  |
Revenue by geographical area |  |  |
Revenue | 17,195 | 17,355 | 19,053
Switzerland |  |  |
Revenue by geographical area |  |  |
Revenue | 20,454 | 19,710 | 20,780
United Kingdom |  |  |
Revenue by geographical area |  |  |
Revenue | 14,981 | 15,634 | 15,153
Italy |  |  |
Revenue by geographical area |  |  |
Revenue | 8,153 | 8,387 | 11,412
Netherlands |  |  |
Revenue by geographical area |  |  |
Revenue | 7,459 | 7,924 | 7,977
Other Europe |  |  |
Revenue by geographical area |  |  |
Revenue | 25,886 | 23,051 | 22,928
Asia Pacific |  |  |
Revenue by geographical area |  |  |
Revenue | € 19,332 | € 18,077 | € 19,988

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