Share-based payments - Summary of the Number and Weighted Average Exercise Prices Movements in Stock Options (Detail)	12 Months Ended
Dec. 31, 2021 shares € / shares	Dec. 31, 2020 shares € / shares
Disclosureofnumberandweightedaverageexercisepricesofshareoptions [Abstract]
Number stock options, Beginning balance \| shares	1,465,295	392,850
Number stock options, Granted \| shares	1,144,000	1,072,445
Number stock options, Exercised \| shares	(34,000)	0
Number stock options, Forfeited \| shares	(105,000)	0
Number stock options, Ending balance \| shares	2,470,295	1,465,295
Beginning balance, Weighted average \| € / shares	€ 1.85	€ 0.01
Granted , Weighted average \| € / shares	15.80	2.53
Exercised , Weighted average \| € / shares	2.38	0
Forfeited , Weighted average \| € / shares	16.67	0
Ending balance, Weighted average \| € / shares	€ 9.18	€ 1.85

The number of share options outstanding in a share-based payment arrangement.

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The number of share options exercised in a share-based payment arrangement.

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