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Revenue and other income - Additional information (Details) € in Thousands |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 19, 2023 option | Jan. 25, 2023 EUR (€) | Mar. 31, 2023 EUR (€) target_option | Jun. 30, 2024 EUR (€) | Jun. 30, 2023 EUR (€)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue from collaboration and licensing agreements |  |  |  | € 8,293 | € 35,344
IPH5201 agreement, with AstraZeneca |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue from collaboration and licensing agreements |  |  |  | 0 | 0
External costs related to the clinical trial |  |  |  | 897 | 616
Agreement with Sanofi, 2016 |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Revenue from collaboration and licensing agreements |  |  |  | 4,000 | 2,000
Milestone payment received |  |  |  | 4,000 | € 2,000
Agreement with Sanofi, 2022 |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Advance received |  |  | € 25,000 |  |
Advance received - exclusive license |  |  | 18,500 |  |
Payments for research work |  |  | 1,500 |  |
Payments for target options |  |  | € 5,000 |  |
Number of target options | target_option |  |  | 2 |  |
Agreements with Sanofi for NK Cell engages |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Advance received |  | € 31,800 |  |  |
Advance received - exclusive license |  | 18,500 | € 13,300 |  |
Payments for research work |  |  | € 1,700 | 1,500 |
Payments for target options |  |  |  | € 5,000 |
Number of target options | target_option |  |  | 2 |  |
Number of options excercised for licenses | option | 1 |  |  |  |
Number of exclusive options granted | option | 2 |  |  |  |
Milestone payment received - option exercised |  | € 13,300 |  |  |
Agreement with Sanofi, 2022 |  |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |  |
Milestone payment received - option exercised |  |  | € 15,000 |  |

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