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Lease Liabilities (Details) - Office and laboratory facilities at Zernikedreef in Leiden, the Netherlands € in Thousands		1 Months Ended	9 Months Ended
	Jul. 01, 2020	Dec. 31, 2020	Sep. 30, 2025 EUR (€) m²	Dec. 31, 2024 EUR (€)
Disclosure of quantitative information about right-of-use assets [line items]
Area under lease | m²			4,818
Lease term	10 years	11 years
Lease extension term		1 year
Lease, current extension period under option			5 years
Right-of-use asset | €			€ 10,448	€ 11,433

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- Definition

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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The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

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Area of property under lease as per lease terms.

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