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Basis of presentation - Summary of Change in Presentation of the Warrants Resulted in the Following Impact to the Consolidated Balance Sheet Balance Sheet (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Jul. 01, 2020
Dec. 31, 2019
 [1]
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items]          
Total assets € 254,646   € 134,277    
Other financial liabilities 16,869        
Total current liabilities 77,478   69,296    
Total non-current liabilities 89,781   105,816    
Total liabilities 167,259        
Shareholders' equity (deficit)          
Share capital 629 € 629 1,164    
Share premium 538,695   190,945    
Accumulated deficit (444,478)   (233,194)    
Other reserves (7,459)   (770)    
Total equity (deficit) attributable to shareholders of the parent 87,387   (41,855)    
Total shareholders' equity (deficit) 87,387   (40,835) € (9,171) € (2,255)
Total liabilities and shareholders' equity (deficit) 254,646   € 134,277    
As previously reported          
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items]          
Total assets 254,646        
Total current liabilities 60,609        
Total non-current liabilities 89,781        
Total liabilities 150,390        
Shareholders' equity (deficit)          
Share capital 629        
Share premium 573,339        
Accumulated deficit (462,253)        
Other reserves (7,459)        
Total equity (deficit) attributable to shareholders of the parent 104,256        
Total shareholders' equity (deficit) 104,256        
Total liabilities and shareholders' equity (deficit) 254,646        
Adjustment          
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items]          
Other financial liabilities 16,869        
Total current liabilities 16,869        
Total liabilities 16,869        
Shareholders' equity (deficit)          
Share premium (34,645)        
Accumulated deficit 17,775        
Total equity (deficit) attributable to shareholders of the parent (16,869)        
Total shareholders' equity (deficit) € (16,869)        
[1] See Note 2 for details regarding the change in presentation of Other financial assets