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Accounts payable - Summary of Accounts Payable (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Trade and other current payables [abstract] |  |  |
Accounts payable | € 2,554 | € 4,866 |
Other accrued liabilities | 7,498 | 2,216 |
Total accounts payable | € 10,052 | € 7,082 | [1]
[1] | See Note 2 for details regarding the change in presentation of Other financial assets

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