Deferred Income - Summary of deferred income (Details) - EUR (€) € in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total deferred income	€ 38,946	€ 51,371
Current deferred income	17,552	21,942
Non-current deferred income	21,394	29,429
Eli Lilly and Company
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total deferred income	€ 38,946	50,930	€ 64,739
Rett Syndrome Research Trust
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total deferred income		€ 441

The amount of current deferred income including current contract liabilities. [Refer: Deferred income including contract liabilities]

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The amount of liabilities representing income that has been received (or the amount is due) but is not yet earned, including contract liabilities. [Refer: Contract liabilities]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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The amount of non-current deferred income including non-current contract liabilities. [Refer: Deferred income including contract liabilities]

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