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

Reserves - Summary of Reserves (Detail)

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Reserves - Summary of Reserves (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reserves within equity [line items]      
Beginning balance € 3,823 € 4,592 € 2,561
Exchange differences on translation of foreign operations (14) 8 3
Reclassification 386 (777) 2,028
Ending balance 4,195 3,823 4,592
Legal reserve for capitalized development costs [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 3,812 4,589 2,561
Exchange differences on translation of foreign operations 0 0 0
Reclassification 386 (777) 2,028
Ending balance 4,198 3,812 4,589
Foreign currency translation reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 11 3 0
Exchange differences on translation of foreign operations (14) 8 3
Reclassification 0 0 0
Ending balance € (3) € 11 € 3