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Equity - Additional Information (Details) - EUR (€) |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2022 | Mar. 02, 2022 | Dec. 22, 2021 | Sep. 01, 2021 | Feb. 04, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 06, 2021 | Mar. 02, 2021 | Jan. 31, 2021
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholder paid-in and registered period for double voting rights (in years) |  |  |  |  |  | 2 years |  |  |  |  |
Number of shares in entity held to entitle double voting rights (in shares) |  |  |  |  |  | 2,347,639 |  |  |  |  |
Percentage of double voting rights |  |  |  |  |  | 4.71% |  |  |  |  |
Capital increase |  |  |  |  |  | € 65,332,000 | € 0 | € 126,479,000 |  |  |
Number of shares issued during period (in shares) |  |  | 3,985,239 |  |  |  |  |  |  |  |
+ Proceeds from issue of share capital (net) |  |  | € 28,000,000 |  |  | € 27,972,000 | € 7,000 | € 126,486,000 |  |  |
Total number of shares comprising the share capital (in shares) |  |  |  |  |  | 49,815,489 | 38,888,379 | 38,858,617 |  |  |
Share capital amount |  |  |  |  |  | € 12,453,872.25 |  |  |  |  |
Shares authorized (in shares) |  |  |  |  |  | 49,815,489 |  |  |  |  |
Nominal value (in EUR per share) |  |  |  |  |  | € 0.25 |  |  |  |  |
Additional share based instruments issued (in shares) |  |  |  |  |  | 323,125 |  |  |  |  |
Other movements |  |  |  |  |  | € 0 | € 268,000 | € (43,000) |  |  |
OCEANE |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Capital increase | € 297,812.5 | € 664,578.75 |  | € 13,750,000 | € 759,327.25 |  |  |  |  |  |
Issuance of new shares (in shares) |  |  |  | 55,000 |  |  |  |  | 1,191,250 | 2,658,312 |
Number of shares issued during period (in shares) |  |  |  |  | 3,037,309 |  |  |  |  |  |
Total number of shares comprising the share capital (in shares) |  |  |  |  |  |  |  |  |  |  | 1,923,662
Initial Public Offering |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issuance of new shares (in shares) |  |  |  |  |  |  |  | 7,647,500 |  |  |
Gross amount received from issuance of shares |  |  |  |  |  |  |  | € 137,600,000 |  |  |
AGA S 2018 |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares vested (in shares) |  |  |  |  |  |  | 29,762 |  |  |  |
AGA S 2016-2 |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares vested (in shares) |  |  |  |  |  |  |  | 7,796 |  |  |
AGA S 2017-1 |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares vested (in shares) |  |  |  |  |  |  |  | 19,400 |  |  |

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