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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, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]        
Total gross carrying amount € 29,187 € 40,967   € 37,549
Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 37,886 50,594    
Less than Thirty days [member]        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 8,570 8,614    
Thirty to sixty days [member]        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 1,298 1,409    
Sixty One Days To Ninety Days [member]        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 2,531 1,274    
Past Due Greater Than Ninety One Days [member]        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 10,308 15,046    
Credit risk [member] | Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Trade receivables subject to collective valuation 5,632 11,368 € 12,739  
Trade receivables subject to specific valuation 32,524 39,226 35,585  
Total gross carrying amount 37,886 50,594 48,324  
Expected credit loss 95 64 37  
Credit risk [member] | Less than Thirty days [member] | Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Trade receivables subject to collective valuation € 4,936 € 9,288 € 11,661  
Default rate 0.13% 0.10% 0.11%  
Expected credit loss € 6 € 9 € 13  
Credit risk [member] | Thirty to sixty days [member] | Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Trade receivables subject to collective valuation € 387 € 1,323 € 651  
Default rate 1.42% 0.99% 1.04%  
Expected credit loss € 5 € 13 € 7  
Credit risk [member] | Sixty One Days To Ninety Days [member] | Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Trade receivables subject to collective valuation   € 88 € 254  
Default rate 3.83% 2.90% 2.99%  
Expected credit loss   € 3 € 8  
Credit risk [member] | Past Due Greater Than Ninety One Days [member] | Gross trade receivables        
Disclosure of credit risk exposure [line items]        
Trade receivables subject to collective valuation € 309 € 669 € 173  
Default rate 27.07% 5.80% 5.33%  
Expected credit loss € 84 € 39 € 9