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Operating expenses (Other operating income (expenses) excluded) (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Disposables | € (1,243) | € (1,560) | € (2,210)
Energy and liquids | (539) | (505) | (504)
Patents | (343) | (506) | (401)
Studies | (10,987) | (19,353) | (17,351)
Maintenance | (846) | (933) | (934)
Fees | (2,548) | (1,226) | (1,530)
IT Systems | (651) | (847) | (824)
Support costs (including taxes) | (722) | (568) | (584)
Personnel costs | (10,680) | (10,981) | (10,072)
Depreciation, amortization and provisions | (1,009) | (1,456) | (1,069)
Other operating expenses | (3,209) | (2,192) | (2,549)
Total operating expenses | (32,779) | (40,127) | (38,028)
Research and development expense |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Disposables | (1,243) | (1,560) | (2,210)
Energy and liquids | (539) | (505) | (504)
Patents | (343) | (506) | (401)
Studies | (10,987) | (19,353) | (17,351)
Maintenance | (846) | (933) | (934)
Fees | (201) | (239) | (98)
IT Systems | (597) | (793) | (766)
Personnel costs | (7,518) | (8,076) | (7,625)
Depreciation, amortization and provisions | (832) | (1,060) | (890)
Other operating expenses | (608) | (765) | (978)
Total operating expenses | (23,717) | (33,790) | (31,758)
Marketing - business development expenses |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Fees | (341) |  | 0
IT Systems | (8) | (8) | (9)
Personnel costs | (197) | (202) | (182)
Other operating expenses | (16) | (40) | (34)
Total operating expenses | (563) | (250) | (225)
General and administrative expense |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Fees | (2,005) | (987) | (1,431)
IT Systems | (46) | (46) | (49)
Support costs (including taxes) | (722) | (568) | (584)
Personnel costs | (2,964) | (2,703) | (2,266)
Depreciation, amortization and provisions | (177) | (396) | (179)
Other operating expenses | (2,585) | (1,387) | (1,536)
Total operating expenses | € (8,499) | € (6,087) | € (6,045)

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