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Property, plant and equipment - Summary of Changes to property, plant and equipment (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost [1] € 4,720  
Ending Cost 7,868 € 4,720 [1]
Laboratory Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 3,420  
Ending Cost 5,493 3,420
Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 906  
Ending Cost 894 906
Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 394  
Ending Cost 1,481 394
Adjustment On Adoption IFRS 16    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   (441)
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 17,432 15,116
Additions 5,379 3,016
Disposals 7 (316)
Currency translation differences 367 57
Ending Cost 22,437 17,432
Gross carrying amount [member] | Laboratory Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 12,723 11,222
Additions 3,545 2,204
Disposals 1 (314)
Currency translation differences 299 52
Ending Cost 15,968 12,723
Gross carrying amount [member] | Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 2,956 2,439
Additions 406 515
Disposals   (2)
Currency translation differences 40 4
Ending Cost 3,322 2,956
Gross carrying amount [member] | Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost 1,753 1,455
Additions 1,427 297
Disposals 6  
Currency translation differences 28 1
Ending Cost 3,146 1,753
Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   14,675
Gross carrying amount [member] | Previously stated [member] | Laboratory Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   10,781
Gross carrying amount [member] | Previously stated [member] | Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   2,439
Gross carrying amount [member] | Previously stated [member] | Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   1,455
Gross carrying amount [member] | Adjustment On Adoption IFRS 16 | Laboratory Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost   (441)
Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost (12,712) (11,109)
Additions 2,102 1,797
Disposals 7 (219)
Currency translation differences 239 25
Ending Cost (14,568) (12,712)
Accumulated depreciation [member] | Laboratory Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost (9,303) (8,279)
Additions 1,384 1,219
Disposals 1 (218)
Currency translation differences 210 23
Ending Cost (10,476) (9,303)
Accumulated depreciation [member] | Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost (2,050) (1,793)
Additions 404 256
Disposals   (1)
Currency translation differences 26 2
Ending Cost (2,428) (2,050)
Accumulated depreciation [member] | Office equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Cost (1,359) (1,037)
Additions 315 322
Disposals 6  
Currency translation differences 3  
Ending Cost € (1,665) € (1,359)
[1] See Note 2 for details regarding the change in presentation of Other financial assets