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Fair value re-measurement of share subscription agreement and warrants granted to Gilead - Financial assets (Details) - EUR (€)
€ in Thousands
2 Months Ended 12 Months Ended
Nov. 06, 2019
Nov. 06, 2019
Aug. 23, 2019
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 14, 2019
Disclosure of fair value measurement of assets [line items]                  
Upfront payments             € 38,874 € 6,000  
Share subscription increase           € 960,087 296,188 363,924  
Fair value of financial asset at inception related to the share subscription agreement with Gilead       € 5,847,242   5,847,242 1,316,539 1,181,545  
Fair value of financial liability related to the share subscription agreement with Gilead           (69,540) (48,727)    
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead           (181,644)      
Fair value of financial liability       (181,006)   (181,006) € (69,540) € (48,727)  
Current financial liabilities related to the share subscription agreement       6,198   6,198      
Derivative financial instrument | Gilead | Level 3                  
Disclosure of fair value measurement of assets [line items]                  
Fair value of financial asset at inception related to the share subscription agreement with Gilead       0   0     € 85,601
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead         € (142,350)        
Fair value of financial liability     € (56,749)            
Derecognition of the financial asset through the share premium account related to the share subscription agreement with Gilead     € 56,749            
Fair value re-measurement of the share subscription agreement                  
Disclosure of fair value measurement of assets [line items]                  
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead           (142,350)      
Fair value re-measurement of the financial instrument related to the issuance of warrant A                  
Disclosure of fair value measurement of assets [line items]                  
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead           (35,642)      
Fair value re-measurement of the financial instrument related to the issuance of warrant A | Gilead | Warrant A                  
Disclosure of fair value measurement of assets [line items]                  
Fair value of financial liability related to the share subscription agreement with Gilead   € (43,311)   (43,311)          
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead   (35,642)              
Fair value of financial liability       0   0      
Derecognition of the financial asset through the share premium account related to the share subscription agreement with Gilead € 78,953                
Fair value re-measurement of the financial instrument related to the issuance of initial warrant B                  
Disclosure of fair value measurement of assets [line items]                  
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead           (3,653)      
Fair value re-measurement of the financial instrument related to the issuance of initial warrant B | Gilead | Warrant B                  
Disclosure of fair value measurement of assets [line items]                  
Fair value of financial liability related to the share subscription agreement with Gilead   € (2,545)   (2,545)          
Change in fair value related to the share subscription agreement and warrants with/granted to Gilead       (3,653)          
Fair value of financial liability       € (6,198)   € (6,198)