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Notes to the consolidated financial statements - Operative Expenses (Details) - Operative expenses - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes to the Consolidated Statements of Operations      
Personnel € (113,422) € (99,924) € (94,655)
Materials (78,767) (121,873) (278,542)
Third-party services (67,905) (39,501) (708,636)
Maintenance and lease (15,356) (9,381) (7,528)
Amortization and depreciation (27,229) (26,641) (17,232)
Impairment of equipment (8,085) (24,948) (22,810)
Patents and fees to register a legal right (6,666) (3,813) (3,199)
Legal and other professional services (10,160) (10,394) (9,230)
Other (8,170) (17,064) (14,415)
Total € (335,760) € (353,539) € (1,156,247)