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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, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Total gross carrying amount € 33,934 € 29,187
Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 41,815 37,886
Credit risk [member] | Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables subject to collective valuation 10,007 5,632
Trade receivables subject to specific valuation 31,808 32,524
Total gross carrying amount 41,815 37,886
Expected credit loss 310 95
Less than Thirty days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 3,877 8,570
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 € 9,480 € 4,936
Default rate 0.56% 0.13%
Expected credit loss € 53 € 6
Thirty to sixty days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 1,105 1,298
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 € 264 € 387
Default rate 5.79% 1.42%
Expected credit loss € 15 € 5
Sixty One Days To Ninety Days [member]    
Disclosure of credit risk exposure [line items]    
Total gross carrying amount 347 € 2,531
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 € 24  
Default rate 13.08% 3.83%
Expected credit loss € 3  
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 € 239 € 309
Default rate 100.00% 27.07%
Expected credit loss € 239 € 84