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Warrants and Share-based Payment - Warrant Activity - Additional Information (Detail)
3 Months Ended
Jun. 30, 2018
EUR (€)
shares
Jun. 30, 2018
EUR (€)
shares
Jun. 30, 2018
kr / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share nominal value | kr / shares     kr 1
Warrants [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Aggregate number of other equity instruments granted 6,630,437    
Aggregate number of other equity instruments cancelled | shares 19,580 19,580  
Aggregate number of other equity instruments exercised 1,918,670 317,825  
Aggregate number of other equity instruments expired 2,168    
Aggregate number of other equity instruments forfeited 210,328    
Number of other equity instruments authorized 3,985,875 3,985,875  
Share nominal value | kr / shares     kr 1
Warrants [member] | Bottom of range [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price | € € 6.48 € 6.48  
Warrants [member] | Top of range [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price | € € 60.23 € 60.23