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Financial Risk Management Objectives and Policies - Summary of Liquidity Risk (Detail) - Liquidity risk [member] - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Statements [Line Items] |  |
Financial assets held for managing liquidity risk | € 231,978 | € 119,376
Cash And Cash Equivalents [Member] |  |
Statements [Line Items] |  |
Financial assets held for managing liquidity risk | 207,530 | 103,353
Short-Term Deposits [Member] |  |
Statements [Line Items] |  |
Financial assets held for managing liquidity risk | € 24,448 | € 16,023

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- Definition The amount of financial assets held for managing liquidity risk (for example, financial assets that are readily saleable or expected to generate cash inflows to meet cash outflows on financial liabilities). [Refer: Liquidity risk [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B11E -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B11E&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |