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Debt - Debt and borrowings (Details) € in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 EUR (€) loan | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Jan. 01, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank borrowings |  | € 9,992 | € 74 |  | € 220 |
Other loans and similar borrowings |  | 62 | 3 |  | 5 |
Lease liabilities |  | 2 | 37 |  |  |
Total Debt |  | 10,055 | 114 | € 392 | € 225 | € 482
Increase (Decrease) in borrowings |  |  | 100 |  |  |
Loan obtained |  | 9,979 |  |  |  |
Payments of lease liabilities, classified as financing activities |  | € 26 | 130 |  |  |
Repayments of borrowings |  |  | 100 |  |  |
Financing from a syndicate of French banks |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Number of loans obtained | loan | 3 |  |  |  |  |
Loan obtained | € 10,000 |  |  |  |  |
Extension of term of debt | 4 years | 4 years |  |  |  |
Socit Gnrale |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total Debt |  | € 13 |  |  |  |
IFRS 16 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Lease liabilities |  |  | 167 |  |  |
Payments of lease liabilities, classified as financing activities |  |  | € 100 |  |  |

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of borrowings that the entity does not separately disclose in the same statement or note. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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