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Financial Instruments - Summary of Carrying Amounts and Fair values of Group's Financial Instruments (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Carrying amount € 28,198 € 18,690
Financial liabilities, Carrying amount 12,077 8,370
Financial assets, Fair value 28,198 18,690
Financial liabilities, Fair value 12,077 8,370
Financial assets at fair value through profit or loss, category [member] | ShortTerm Deposits [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Carrying amount 24,448 16,023
Financial assets, Fair value 24,448 16,023
Financial assets at fair value through profit or loss, category [member] | Positive Market Value Forward Contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Carrying amount 914 0
Financial assets, Fair value 914 0
Other Financial Assets At Amortized Cost [Member] | Trade receivables [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Carrying amount 1,250 957
Financial assets, Fair value 1,250 957
Other Financial Assets At Amortized Cost [Member] | Other Current Asset [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, Carrying amount 1,586 1,710
Financial assets, Fair value 1,586 1,710
Other Financial Assets At Amortized Cost [Member] | Accounts Payable [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, Carrying amount 10,052 7,082
Financial liabilities, Fair value 10,052 7,082
Other Financial Assets At Amortized Cost [Member] | Other Current Liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, Carrying amount 2,025 1,288
Financial liabilities, Fair value € 2,025 € 1,288