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Operating Segments - Summary of External Revenue by Location of Customers (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Revenue € 143,769 € 144,185 € 71,579
Percentage of entity's revenue 100.00% 100.00% 100.00%
SPAIN      
Disclosure of geographical areas [line items]      
Revenue € 29,590 € 20,076 € 6,910
Percentage of entity's revenue 21.00% 14.00% 10.00%
UNITED STATES      
Disclosure of geographical areas [line items]      
Revenue € 22,268 € 19,412 € 4,713
Percentage of entity's revenue 15.00% 13.00% 7.00%
ITALY      
Disclosure of geographical areas [line items]      
Revenue € 14,686 € 14,927 € 7,338
Percentage of entity's revenue 10.00% 10.00% 10.00%
GERMANY      
Disclosure of geographical areas [line items]      
Revenue € 9,111 € 7,944 € 12,034
Percentage of entity's revenue 6.00% 6.00% 17.00%
Other Countries [Member]      
Disclosure of geographical areas [line items]      
Revenue € 68,114 € 81,826 € 40,584
Percentage of entity's revenue 47.00% 57.00% 57.00%