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Share-Based Payments - Summary of Fair Value of Warrants Cox Ross Rubinstein Binomial Option Pricing Model (Detail) - € / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Share Based Payment Award Fair Value Of Warrants Valuation Assumptions [Line Items]              
Weighted average share price at grant date (in €)   € 10.75          
Weighted average expected volatility   90.00%          
Weighted average risk-free interest rate   (0.53%)          
Weighted average expected term (in years)   3 years 2 months 15 days          
Dividend yield 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Weighted average fair value of warrants (in €)   € 0