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Inventories - Summary of Changes in the Provision for Slow Moving and Obsolete Raw Materials and Finished Products (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Classes Of Inventories [Abstract]    
Beginning balance € 11,855 € 9,341
Additions 3,371 2,892
Reductions (2,167) (378)
Ending balance € 13,059 € 11,855