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Trade receivables and contract assets - Summary of Expected Credit Losses for Trade Receivables and Contract Assets (Details) - Trade receivables and contract assets - Accumulated impairment [member] - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Trade receivables and contract assets    
Balance as of January 1, € (5,620) € (4,373)
Provision for expected credit losses (7,160) (1,456)
Net amounts recovered 183 209
Write-Offs 2,559  
Other 72  
Balance as of December 31, € (9,966) € (5,620)