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Loans and Borrowings - Summary of Bank Loans (Details) - Bank loans - Research and Laboratory Equipment € in Thousands | 12 Months Ended
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Dec. 31, 2021 EUR (€) Facility Size | Dec. 31, 2020 EUR (€) Facility Size | Dec. 31, 2019 EUR (€) Facility Size
Disclosure of detailed information about borrowings [line items] |  |  |
Facility size | Facility Size | 20,465,000 | 5,215,000 | 5,215,000
Interest rate (in percent) |  |  |
New debt recognized | € 0 | € 0 | € 0
Installments |  |  |
Bank loan outstanding | € 15,864 | € 1,540 | € 2,645
CDN 3 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | April 2016 | April 2016 | April 2016
Facility size | Facility Size | 500,000 | 500,000 | 500,000
Interest rate (in percent) | 0.72% | 0.72% | 0.72%
New debt recognized | € 0 | € 0 | € 0
Installments | 60 monthly | 60 monthly | 60 monthly
Bank loan outstanding | € 0 | € 34 | € 135
CDN 4 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2017 | June 2017 | June 2017
Facility size | Facility Size | 600,000 | 600,000 | 600,000
Interest rate (in percent) | 0.36% | 0.36% | 0.36%
New debt recognized | € 0 | € 0 | € 0
Installments | 48 monthly | 48 monthly | 48 monthly
Bank loan outstanding | € 0 | € 75 | € 226
CDN 5 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | November 2018 | November 2018 | November 2018
Facility size | Facility Size | 500,000 | 500,000 | 500,000
Interest rate (in percent) | 0.46% | 0.46% | 0.46%
New debt recognized | € 0 | € 0 | € 0
Installments | 48 monthly | 48 monthly | 48 monthly
Bank loan outstanding | € 115 | € 241 | € 365
CIC 4 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | December 2016 | December 2016 | December 2016
Facility size | Facility Size | 265,000 | 265,000 | 265,000
Interest rate (in percent) | 0.69% | 0.69% | 0.69%
New debt recognized | € 0 | € 0 | € 0
Installments | 60 monthly | 60 monthly | 60 monthly
Bank loan outstanding | € 4 | € 58 | € 111
CIC 5 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | July 2017 | July 2017 | July 2017
Facility size | Facility Size | 1,000,000 | 1,000,000 | 1,000,000
Interest rate (in percent) | 0.69% | 0.69% | 0.69%
New debt recognized | € 0 | € 0 | € 0
Installments | 60 monthly | 60 monthly | 60 monthly
Bank loan outstanding | € 152 | € 354 | € 554
BNP 2 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2016 | June 2016 | June 2016
Facility size | Facility Size | 500,000 | 500,000 | 500,000
Interest rate (in percent) | 0.80% | 0.80% | 0.80%
New debt recognized | € 0 | € 0 | € 0
Installments | 20 quarterly | 20 quarterly | 20 quarterly
Bank loan outstanding | € 0 | € 76 | € 177
BNP 3 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | October 2016 | October 2016 | October 2016
Facility size | Facility Size | 1,050,000 | 1,050,000 | 1,050,000
Interest rate (in percent) | 0.80% | 0.80% | 0.80%
New debt recognized | € 0 | € 0 | € 0
Installments | 20 quarterly | 20 quarterly | 20 quarterly
Bank loan outstanding | € 105 | € 315 | € 525
BNP 4 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | April 2017 | April 2017 | April 2017
Facility size | Facility Size | 800,000 | 800,000 | 800,000
Interest rate (in percent) | 0.87% | 0.87% | 0.87%
New debt recognized | € 0 | € 0 | € 0
Installments | 60 monthly | 60 monthly | 60 monthly
Bank loan outstanding | € 217 | € 377 | € 537
AUTRES |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | - | - | -
Facility size | Facility Size | 0 | 0 | 0
Interest rate (in percent) | 0.00% | 0.00% | 0.00%
New debt recognized | € 0 | € 0 | € 0
Installments | 0 | 0 | 0
Bank loan outstanding | € 20 | € 9 | € 14
CDN PGE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2021 | June 2021 | June 2021
Facility size | Facility Size | 900,000 | 0 | 0
New debt recognized | € 0 | € 0 | € 0
Installments | 8 quaterly | 8 quaterly | 8 quaterly
Bank loan outstanding | € 900 | € 0 | € 0
CIC PGE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2021 | June 2021 | June 2021
Facility size | Facility Size | 2,200,000 | 0 | 0
New debt recognized | € 0 | € 0 | € 0
Installments | 8 quaterly | 8 quaterly | 8 quaterly
Bank loan outstanding | € 2,200 | € 0 | € 0
BNP PGE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2021 | June 2021 | June 2021
Facility size | Facility Size | 4,900,000 | 0 | 0
New debt recognized | € 0 | € 0 | € 0
Installments | 8 quaterly | 8 quaterly | 8 quaterly
Bank loan outstanding | € 4,900 | € 0 | € 0
NATIXIS PGE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | June 2021 | June 2021 | June 2021
Facility size | Facility Size | 3,000,000 | 0 | 0
New debt recognized | € 0 | € 0 | € 0
Installments | 8 quaterly | 8 quaterly | 8 quaterly
Bank loan outstanding | € 3,000 | € 0 | € 0
BPI PGE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | July 2021 | July 2021 | July 2021
Facility size | Facility Size | 2,000,000 | 0 | 0
Interest rate (in percent) | 1.85% | 1.85% | 1.85%
New debt recognized | € 0 | € 0 | € 0
Installments | 16 quaterly | 16 quaterly | 16 quaterly
Bank loan outstanding | € 2,000 | € 0 | € 0
BPI PRÊT TAUX BONIFIE |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt maturity date | November 2021 | November 2021 | November 2021
Facility size | Facility Size | 2,250,000 | 0 | 0
Interest rate (in percent) | 2.25% | 2.25% | 2.25%
New debt recognized | € 0 | € 0 | € 0
Installments | 20 quaterly | 20 quaterly | 20 quaterly
Bank loan outstanding | € 2,250 | € 0 | € 0

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