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Financial Instruments - Fair Values and Risk Management - Summary of Information about Credit Risk Exposure on Trade Receivables Using a Provision Matrix (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]    
Total gross carrying amount € 33,304 € 39,056
Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 37,567 44,660
Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation 1,995 2,514
Trade receivables subject to specific valuation 35,572 42,146
Total gross carrying amount 37,567 44,660
Expected credit loss 89 43
Less than Thirty days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 4,707 7,158
Less than Thirty days [member] | Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation € 1,798 € 2,332
Default rate 0.86% 0.53%
Expected credit loss € 15 € 12
Thirty to sixty days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 1,053 1,355
Thirty to sixty days [member] | Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation € 83 € 68
Default rate 13.06% 5.46%
Expected credit loss € 11 € 4
Sixty One Days To Ninety Days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 429 563
Sixty One Days To Ninety Days [member] | Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation € 78 € 84
Default rate 37.78% 17.08%
Expected credit loss € 29 € 14
Past Due Greater Than Ninety Days [member] | Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation € 36 € 30
Default rate 95.31% 43.47%
Expected credit loss € 34 € 13