Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Provisions - Summary of Maturities of Total Provisions (Detail)

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Provisions - Summary of Maturities of Total Provisions (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions € 381 € 571  
Jubilee Provisions [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 73 78  
Restructuring provision [member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 248 423 € 0
Miscellaneous other provisions [member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 60 € 70  
Amounts due within one year [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 248    
Amounts due within one year [Member] | Restructuring provision [member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 248    
Amounts due between one and five years [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 8    
Amounts due between one and five years [Member] | Jubilee Provisions [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 8    
Amounts due after five years [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 125    
Amounts due after five years [Member] | Jubilee Provisions [Member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions 65    
Amounts due after five years [Member] | Miscellaneous other provisions [member]      
Disclosure Of Maturities Of Total Provisions [Line Items]      
Other provisions € 60