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Share Capital, Reserves and Retained Earnings - Summary of Changes in Equity Interest (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Share Capital Reserves And Other Equity Interest [Abstract]      
Share capital € 54,853 € 54,853 € 54,853
Reserves 13,043 17,147 17,198
Retained earnings 6,448 31,126 64,496
EQUITY ATTRIBUTABLE TO OWNERS OF THE COMPANY € 74,344 € 103,126 € 136,547