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Subsequent Events - Additional Information (Detail)
 1 Months Ended 6 Months Ended
May 01, 2018
Jul. 31, 2019
EUR (€)
m²
Jun. 30, 2019
Disclosure of Events After Reporting Period [line items]      
Operating lease term of lease agreement 5 years   2 years
Non adjusting event [member]      
Disclosure of Events After Reporting Period [line items]      
Square meter of office space under lease agreement | m²   5,070  
Operating lease term of lease agreement   10 years  
Leases commencement period   Mid-2022  
Operating lease termination period   20 years  
Description of additional renewal term   The Lease will renew for two 5-year terms following the initial term  
Estimated initial rent per annum | €   € 1,323,780  
Minimum consumer price index (CPI) change for rent amount change   3.00%