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Share-Based Compensation - Warrants (Details) - € / shares
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Shares    
Outstanding (in shares) 244,457 302,775
Granted (in shares) 0  
Exercised (in shares) (58,318)  
Canceled (in shares) 0  
Expired (in shares) 0  
Vested and exercisable (in shares) 237,852  
Weighted-average exercise price (in Euro per share) € 17.65  
Weighted-average remaining contractual term outstanding 4 years 8 months 23 days  
Aggregate intrinsic value € 12.98