XML 54 R32.htm IDEA: XBRL DOCUMENT v3.10.0.1
General Information - Additional Information (Detail)
€ / shares in Units, $ / shares in Units, € in Thousands, $ in Millions
1 Months Ended 6 Months Ended
Feb. 13, 2018
USD ($)
$ / shares
shares
Feb. 28, 2018
EUR (€)
Feb. 28, 2018
USD ($)
Jan. 31, 2017
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2017
EUR (€)
[1]
Feb. 13, 2018
€ / shares
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
[1]
Disclosure of general information [abstract]                  
Common shares issued | shares 3,099,997                
Issue price per share | € / shares             € 0.09    
Aggregate purchase price $ 55.8 € 44,800 $ 55.8 $ 80.0 € 44,731 € 74,431      
Purchase price | $ / shares $ 18.00                
Cash and cash equivalents         170,327 € 215,788   € 149,678 [1] € 56,917
Investments         € 53,727     € 41,103  
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.