Financial Instruments - Summary of Carrying Amounts and Fair values of Group's Financial Instruments (Detail) - EUR (€) € in Thousands | Jun. 30, 2024 | Dec. 31, 2023 |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | € 0 | € 0 |
At cost or in accordance with IFRS 16 within fair value model [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 17,413 | 15,402 |
Cash and cash equivalents [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 158,143 | 218,472 |
Short-Term Deposits [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | [1] | 372,964 | 207,423 |
Accounts receivables [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 2,811 | 4,093 |
Other current/non-current assets [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | [1] | 8,187 | 4,552 |
Accounts payables [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 18,791 | 24,280 |
Other current liabilities [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 50 | 50 |
Liabilities for warrants [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 18,598 | 18,993 |
Lease liabilities [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets and Financial liabilities | | 17,413 | 15,402 |
Lease liabilities [Member] | At cost or in accordance with IFRS 16 within fair value model [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 17,413 | 15,402 |
Financial liabilities at fair value through profit or loss, category [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 18,598 | 18,993 |
Financial liabilities at fair value through profit or loss, category [Member] | Liabilities for warrants [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 18,598 | 18,993 |
Financial liabilities at amortised cost, category [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 18,841 | 24,330 |
Financial liabilities at amortised cost, category [Member] | Accounts payables [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 18,791 | 24,280 |
Financial liabilities at amortised cost, category [Member] | Other current liabilities [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 50 | 50 |
Financial liabilities at amortised cost, category [Member] | Lease liabilities [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial liabilities, Carrying amount | | 0 | 0 |
Financial assets at amortised cost, category [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets, Carrying amount | | 542,105 | 434,540 |
Financial assets at amortised cost, category [Member] | Cash and cash equivalents [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets, Carrying amount | | 158,143 | 218,472 |
Financial assets at amortised cost, category [Member] | Short-Term Deposits [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets, Carrying amount | [1] | 372,964 | 207,423 |
Financial assets at amortised cost, category [Member] | Accounts receivables [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets, Carrying amount | | 2,811 | 4,093 |
Financial assets at amortised cost, category [Member] | Other current/non-current assets [Member] | | | |
Disclosure of detailed information about financial instruments [line items] | | | |
Financial assets, Carrying amount | [1] | € 8,187 | € 4,552 |
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[1]“Short-term deposits” are classified within the balance sheet item “Other financial assets”. Other current/non-current assets comprise mainly of accrued interest and deposits. | |