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Leases - Additional Information (Detail) - EUR (€)
€ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]        
Property , plant and equipment € 24,032 € 24,032   € 4,325
Right-of-use-assets 17,500 17,500 € 18,400  
Additions in right-of-use-assets   68    
Depreciation on right-of-use-assets 1,000      
Carrying amount of lease liabilities 17,484 17,484 € 17,700  
Non-current lease liabilities 13,213 13,213    
Current lease liabilities 4,271 4,271    
Interest on lease liabilities   € 137    
Research and Development Costs [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Depreciation on right-of-use-assets 800      
General and Administrative Expenses [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Depreciation on right-of-use-assets € 200