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Other Payables - Additional Information (Detail) - EUR (€) € in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 02, 2020 | Dec. 31, 2021 | Feb. 28, 2020
Trade And Other Current Payables [Abstract] |  |  |
Payment received from parents majority shareholder |  | € 2,500 |
Subscription price of a future rights issue |  |  | € 15,000
Partial receipt of subscription price of a future rights issue | € 2,500 |  |
Amount paid back to parent's majority shareholder |  | € 2,500 |

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