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Borrowings - Additional Information (Details) - EUR (€)
1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 28, 2021
Apr. 30, 2019
Borrowings            
Amount drawdown   € 0 € 0 € 17,500,000    
Loan agreement with UniCredit Leasing CZ            
Borrowings            
Amount outstanding           € 562,000
Balance owing     136,000      
Bootstrap Europe            
Borrowings            
Financial liabilities, at fair value   € 12,200,000        
Percentage of ownership interest pledged as security   100.00%        
Bootstrap Europe Loan Agreement | Bootstrap Europe            
Borrowings            
Principal amount of loan € 25,000,000          
Bootstrap Europe Loan Agreement | Loan facility tranche one            
Borrowings            
Amount outstanding         € 10,000,000  
Principal amount of loan 10,000,000          
Bootstrap Europe Loan Agreement | Loan facility tranche two            
Borrowings            
Amount outstanding       € 7,500,000    
Principal amount of loan 7,500,000          
Bootstrap Europe Loan Agreement | Loan facility tranche three            
Borrowings            
Undrawn borrowings     € 7,500,000      
Principal amount of loan € 7,500,000          
European Central Bank Base Rate | Bootstrap Europe            
Borrowings            
Interest at greater of European Central Bank Base Rate 0.00%          
Interest at greater of European Central Bank Base Rate, plus 5.5% 5.50%