Financial assets and liabilities (Details) € in Thousands	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 EUR (€)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	€ 166,939	€ 205,228
Financial assets, at fair value	138,497	176,754
Financial liabilities, at fair value	€ 164,966	€ 162,256
Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Percentage of reasonably possible increase in unobservable input, liabilities	1.00%	1.00%
Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Percentage of reasonably possible increase in unobservable input, assets	1.00%	1.00%
Percentage of reasonably possible increase in unobservable input, liabilities	1.00%	1.00%
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	€ 23,680	€ 24,803
LIABILITIES AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	141,286	137,453
Financial liabilities-non current portion
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	63,055	73,497
Financial liabilities-non current portion | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	3,795	3,620
Financial liabilities-non current portion | LIABILITIES AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	59,260	69,877
Financial liabilities-current portion
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	45,386	44,935
Financial liabilities-current portion | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	19,885	21,183
Financial liabilities-current portion | LIABILITIES AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	25,501	23,752
Trade payables and other current liabilities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	56,525	43,824
Trade payables and other current liabilities | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	0	0
Trade payables and other current liabilities | LIABILITIES AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities, at fair value	56,525	43,824
ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	65,088	0
ASSETS AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	73,410	176,754
Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	139,504	177,537
Financial liabilities	167,904	157,828
Recurring fair value measurement | Financial liabilities-non current portion
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	€ 65,993	€ 69,069
Recurring fair value measurement | Kreos / Claret convertible notes (OCABSA) | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Significant unobservable input, liabilities		0.0750
Recurring fair value measurement | Kreos & Claret Financing, Tranche A,B and C | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Significant unobservable input, liabilities	0.1000
Decrease in financial liabilities at fair value	€ 773	€ 538
Recurring fair value measurement | PGE | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Significant unobservable input, liabilities	0.0950	0.0900
Decrease in financial liabilities at fair value	€ 15	€ 39
Recurring fair value measurement | Financial liabilities-current portion
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	45,386	44,935
Recurring fair value measurement | Trade payables and other current liabilities
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial liabilities	56,525	43,824
Other financial assets
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	12,500	12,690
Other financial assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	0	0
Other financial assets | ASSETS AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	12,500	12,690
Other financial assets | Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	13,507	13,473
Other receivables and assets
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	22,422	19,843
Other receivables and assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	0	0
Other receivables and assets | ASSETS AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	22,422	19,843
Other receivables and assets | Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	22,422	19,843
Long-term advances made to CROs | Recurring fair value measurement | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Decrease in financial assets at fair value	€ 206	€ 236
Long-term advances made to CROs | Recurring fair value measurement | Bottom of range | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Significant unobservable input, assets	0.0105	0.0104
Long-term advances made to CROs | Recurring fair value measurement | Top of range | Credit spread | Discounted cash flow
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Significant unobservable input, assets	0.0325	0.0218
Cash and cash equivalents
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	€ 103,576	€ 144,221
Cash and cash equivalents | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	65,088	0
Cash and cash equivalents | ASSETS AT AMORTIZED COST
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets, at fair value	38,488	144,221
Cash and cash equivalents | Recurring fair value measurement
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]
Financial assets	€ 103,576	€ 144,221