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Share-based compensation - Accelerate! options (Detail)
12 Months Ended
Dec. 31, 2022
€ / shares
Dec. 31, 2022
€ / shares
$ / shares
Dec. 31, 2021
€ / shares
Dec. 31, 2021
$ / shares
Euro [Member]        
Share-based compensation [Line Items]        
Number of share options outstanding in share-based payment arrangement 750 750    
Euro [Member] | Accelerate options [Member]        
Share-based compensation [Line Items]        
Number of share options outstanding in share-based payment arrangement 55,000 55,000 136,975 136,975
Weighted average exercise price of share options outstanding in share-based payment arrangement € 22.43 € 22.43 € 18.13  
Number of share options exercised in share-based payment arrangement (81,975) (81,975)    
Weighted average exercise price of share options exercised in share-based payment arrangement € 15.24      
Number of share options exercisable in share-based payment arrangement 55,000 55,000    
Weighted average exercise price of share options exercisable in share-based payment arrangement € 22.43 € 22.43    
US Dollar [Member]        
Share-based compensation [Line Items]        
Number of share options outstanding in share-based payment arrangement 1,950 1,950    
US Dollar [Member] | Accelerate options [Member]        
Share-based compensation [Line Items]        
Number of share options outstanding in share-based payment arrangement     17,500 17,500
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ / shares       $ 20.02
Number of share options exercised in share-based payment arrangement (17,500) (17,500)    
Weighted average exercise price of share options exercised in share-based payment arrangement | $ / shares   € 20.02