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Warrants and Share-based Payment - Warrant Activity - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
EUR (€)
shares
Jun. 30, 2019
EUR (€)
shares
Jun. 30, 2019
kr / shares
Dec. 31, 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   8,304,687    
Aggregate number of other equity instruments cancelled | shares 19,580 19,580    
Aggregate number of other equity instruments exercised 618,089 2,830,617    
Aggregate number of other equity instruments expired   2,168    
Aggregate number of other equity instruments forfeited   253,145    
Number of other equity instruments authorized 2,311,625 2,311,625    
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 | € € 107.14 € 107.14