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Non-cash stock-based compensation - Summary of Number of Shares Outstanding and Weighted Average Grant Date Fair Value (Detail) - S A free shares [member]
6 Months Ended 12 Months Ended
Jun. 30, 2023
€ / shares
Dec. 31, 2022
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Option outstanding, beginning balance 909,113 922,701
Option outstanding, granted 342,900 354,770
Option outstanding, exercised/vested   (191,658)
Option outstanding, forfeited, cancelled or expired (36,112) (176,700)
Option outstanding, ending balance 1,215,901 909,113
Weighted average exercise price per share, beginning balance € 11.18 € 14.15
Weighted average exercise price per share, granted 3.08 2.79
Weighted average exercise price per share, exercised   17.96
Weighted average exercise price per share, cancelled, forfeited or expired 11.1 13.99
Weighted average exercise price per share, ending balance € 8.9 € 11.18