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Warrants and Share-based Payment - Warrant Activity - Additional Information (Detail)
Mar. 31, 2019
EUR (€)
shares
Mar. 31, 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 8,132,687    
Aggregate number of other equity instruments cancelled | shares 19,580    
Aggregate number of other equity instruments exercised 2,212,528    
Aggregate number of other equity instruments expired 2,168    
Aggregate number of other equity instruments forfeited 247,634    
Number of other equity instruments authorized 2,483,625    
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    
Warrants [member] | Top of range [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price | € € 62.15