General and administrative expense - Additional Information (Detail) - EUR (€) € in Thousands  | 
6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2022  | 
Jun. 30, 2021  | 
Dec. 31, 2021  | 
Dec. 31, 2020  | 
Dec. 31, 2019  | 
|
| General and Administrative Expenses [Abstract] | |||||
| Share-based payment expenses | € 46,433 | € 83,995 | € 202,201 | € 4,650 | € 0 | 
| X | ||||||||||
- Definition Equity settled share based payment arrangement legal accounting and consulting fees. No definition available. 
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| X | ||||||||||
- Definition General and administrative expenses. No definition available. 
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