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Trade and Other Receivables - Summary of Short-Term Receivables that are Due WIthin One Year (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Trade and other current payables [abstract]    
Trade receivables € 1,393 € 2,690
Unbilled receivables 72 236
VAT receivable 684 891
Prepaid expenses 4,526 2,783
Prepaid pension costs 631  
Interest receivable 312 213
Other receivables 677 219
Total € 8,295 € 7,032