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Revenue - Disclosure Of Changes In Trade Receivables Contract Assets And Contract Liabilities Explanatory (Detail)
€ in Thousands
 6 Months Ended
Jun. 30, 2019
EUR (€)
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items]  
Trade receivables, beginning balance € 2,690
Trade receivables, additions 5,819
Trade receivables, deductions (7,116)
Trade receivables, ending balance 1,393
Contract assets, beginning balance 236
Contract assets, additions 114
Contract assets, deductions (278)
Contract assets, ending balance 72
Contract liabilities, beginning balance 114,609
Contract liabilities, additions 848
Contract liabilities, deductions (8,583)
Contract liabilities, ending balance 106,874
Deferred revenue [member]  
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items]  
Contract liabilities, beginning balance 114,609
Contract liabilities, additions 848
Contract liabilities, deductions (8,583)
Contract liabilities, ending balance 106,874
Trade receivables [member]  
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items]  
Trade receivables, beginning balance 2,690
Trade receivables, additions 5,819
Trade receivables, deductions (7,116)
Trade receivables, ending balance 1,393
Unbilled receivables [member]  
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items]  
Contract assets, beginning balance 236
Contract assets, additions 114
Contract assets, deductions (278)
Contract assets, ending balance € 72