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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Text Block [Abstract] |
Disclosure of detailed information about property, plant and equipment [text block] | Changes to property, plant and equipment during 2020 and 2019 consisted of the following:
(Euros in thousands) |  | Laboratory equipment |  |  | Computer equipment |  |  | Office equipment |  |  | Total |
Cost as of January 1, 2019 |  |  | 11,222 |  |  |  | 2,439 |  |  |  | 1,455 |  |  |  | 15,116 |
Impact of IFRS 16 adoption |  |  | (441 | ) |  |  | — |  |  |  | — |  |  |  | (441 | )
Cost as of January 1, 2019, adjusted |  |  | 10,781 |  |  |  | 2,439 |  |  |  | 1,455 |  |  |  | 14,675 |
Additions |  |  | 2,204 |  |  |  | 515 |  |  |  | 297 |  |  |  | 3,016 |
Disposals |  |  | (314 | ) |  |  | (2 | ) |  |  | — |  |  |  | (316 | )
Currency translation differences |  |  | 52 |  |  |  | 4 |  |  |  | 1 |  |  |  | 57 |
Cost as of December 31, 2019 |  |  | 12,723 |  |  |  | 2,956 |  |  |  | 1,753 |  |  |  | 17,432 |
Accumulated depreciation as of January 1, 2019 |  |  | 8,279 |  |  |  | 1,793 |  |  |  | 1,037 |  |  |  | 11,109 |
Additions |  |  | 1,219 |  |  |  | 256 |  |  |  | 322 |  |  |  | 1,797 |
Disposals |  |  | (218 | ) |  |  | (1 | ) |  |  | — |  |  |  | (219 | )
Currency translation differences |  |  | 23 |  |  |  | 2 |  |  |  | — |  |  |  | 25 |
Accumulated depreciation as of December 31, 2019 |  |  | 9,303 |  |  |  | 2,050 |  |  |  | 1,359 |  |  |  | 12,712 |
Net book value as of December 31, 2019 |  |  | 3,420 |  |  |  | 906 |  |  |  | 394 |  |  |  | 4,720 |
Cost as of January 1, 2020 |  |  | 12,723 |  |  |  | 2,956 |  |  |  | 1,753 |  |  |  | 17,432 |
Additions |  |  | 3,545 |  |  |  | 406 |  |  |  | 1,427 |  |  |  | 5,379 |
Disposals |  |  | 1 |  |  |  | — |  |  |  | 6 |  |  |  | 7 |
Currency translation differences |  |  | 299 |  |  |  | 40 |  |  |  | 28 |  |  |  | 367 |
Cost as of December 31, 2020 |  |  | 15,968 |  |  |  | 3,322 |  |  |  | 3,146 |  |  |  | 22,437 |
Accumulated depreciation as of January 1, 2020 |  |  | 9,303 |  |  |  | 2,050 |  |  |  | 1,359 |  |  |  | 12,712 |
Additions |  |  | 1,384 |  |  |  | 404 |  |  |  | 315 |  |  |  | 2,102 |
Disposals |  |  | 1 |  |  |  | — |  |  |  | 6 |  |  |  | 7 |
Currency translation differences |  |  | 210 |  |  |  | 26 |  |  |  | 3 |  |  |  | 239 |
Accumulated depreciation as of December 31, 2020 |  |  | 10,476 |  |  |  | 2,428 |  |  |  | 1,665 |  |  |  | 14,568 |
Net book value as of December 31, 2020 |  |  | 5,493 |  |  |  | 894 |  |  |  | 1,481 |  |  |  | 7,868 |
Disclosure Of Depreciation Expenses [Table Text Block] | Depreciation expense is included in the following line items of the Consolidated Statement of Loss:
|  | Year ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (Euros in thousands) |
Research and development expenses |  |  | 1,503 |  |  |  | 1,315 |  |  |  | 1,757 |
General and administrative expenses |  |  | 600 |  |  |  | 482 |  |  |  | 301 |
Total |  |  | 2,103 |  |  |  | 1,797 |  |  |  | 2,058 |

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