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Commitments (Details) € in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2022 | Jan. 01, 2021 | Feb. 03, 2020 USD ($) | Dec. 21, 2018 USD ($) | Jun. 30, 2021 patient | Jan. 31, 2019 | Dec. 31, 2024 EUR (€) lease | Dec. 31, 2024 USD ($) lease | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Jul. 19, 2023 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
EIB loan guarantee (as a percent) |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |  |
Number of short term leases | lease |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Annual short term lease expense |  |  |  |  |  |  |  | $ 105 |  |  |  |  |  |
Annual lease expense | € |  |  |  |  |  |  | € 20 |  |  |  |  |  |  |
Prepaid expenses | € |  |  |  |  |  |  | 3,195 |  |  |  |  |  | € 2,560 |
Milestone payment upon second regulatory approval |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750
Trade receivables | € |  |  |  |  |  |  | 2,977 |  |  |  |  |  | 905 |
MD Anderson Cancer Center, NBTXR3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patients | patient |  |  |  |  | 312 |  |  |  |  |  |  |  |  |
Contractual capital commitments |  |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |
Milestone payment, deferment period |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Prepaid expenses | € |  |  |  |  |  |  | € 1,200 |  |  |  |  |  | € 1,200 |
Termination of PharmaEngine License and Collaboration Agreement, NBTXR3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  |  |  |  |  |  |  |  | $ 6,500 |  |  |  |
Milestone payment upon receipt of clinical study reports |  |  |  |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  |  |
Milestone payment upon second regulatory approval |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |
Royalties agreement, period |  |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |
Janssen | NBTXR3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | € |  |  |  |  |  |  | € 4,300 |  |  |  |  |  |  |
Janssen | Technology Transfer and Technical |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | € |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
EIB fixed rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalties agreement, period | 6 years | 6 years |  |  |  |  |  |  |  |  |  |  |  |
Minimum | EIB fixed rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated financial effect of contingent liabilities | € |  |  |  |  |  |  | € 35,000 |  |  |  |  |  |  |
Maximum | Event One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment increase |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  |
Maximum | Event Two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment increase |  |  |  |  |  |  |  |  |  |  | $ 16,400 |  |  |

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