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Company information - New share warrant plans ("BSA") (Details) |  | 12 Months Ended
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Mar. 09, 2020 item | Dec. 31, 2020 item | Dec. 31, 2020 | Dec. 31, 2019 item
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of other equity instruments granted in share-based payment arrangement |  |  |  | 10,000
BSA 2019 bis |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of other equity instruments granted in share-based payment arrangement |  | 10,000 | 10,000 |
BSA 2019 bis | Jeremy Goldberg |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of share warrants granted | 10,000 |  |  |
BSA 2019 ter |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of other equity instruments granted in share-based payment arrangement |  | 36,000 | 36,000 |
BSA 2019 ter | David Nikodem |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of share warrants granted | 36,000 |  | 36,000 |
BSA - 2019 plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of other equity instruments granted in share-based payment arrangement | 46,000 |  |  | 10,000
BSA - 2019 plan | David Nikodem |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of other equity instruments granted in share-based payment arrangement |  |  |  | 10,000

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