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Financial Risk Management Objectives and Policies - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [2] | Dec. 31, 2017
Statements [Line Items] |  |  |  |  |
Cash and cash equivalents | € 207,530 | € 103,353 | [1] | € 39,367 | € 8,415
Credit risk [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Maximum exposure to credit risk | 232,000 | 119,000 |  |  |
Cash and cash equivalents | 208,000 | 103,000 |  |  |
Other financial assets | 24,000 | € 16,000 |  |  |
Currency risk [member] | Top of range [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | 10,900 |  |  |  |
Currency risk [member] | Bottom of range [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | € 13,200 |  |  |  |
Currency risk [member] | Euro [Member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk | 10.00% |  |  |  |
Currency risk [member] | US [Member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage Of Reasonably Possible Increase In Foreign Currency Risk | 10.00% |  |  |  |
[1] | See Note 2 for details regarding the change in presentation of Other financial assets
[2] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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