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

Trade and other receivables - Schedule of Movements in Loss Allowance (Detail)

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Trade and other receivables - Schedule of Movements in Loss Allowance (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule of The Movements In The Loss Allowance [Line Items]    
Opening balance loss allowance at the beginning of the year € 2  
Closing balance loss allowance at the end of the year 1 € 2
Trade receivables [member]    
Schedule of The Movements In The Loss Allowance [Line Items]    
Opening balance loss allowance at the beginning of the year 2 1
Additions to bad debt allowance 0 1
Receivables written off during the year as uncollectible 0 0
Unused amount reversed during the year (1) 0
Closing balance loss allowance at the end of the year 1 2
Contract assets [member]    
Schedule of The Movements In The Loss Allowance [Line Items]    
Opening balance loss allowance at the beginning of the year 0 0
Additions to bad debt allowance 0 0
Receivables written off during the year as uncollectible 0 0
Unused amount reversed during the year 0 0
Closing balance loss allowance at the end of the year € 0 € 0