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Company Information - Capital increase of 14.7 million (Details) - EUR (€) € / shares in Units, € in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 07, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |  |  |
Par value per share |  | € 0.01 |  |
Net proceeds from issuance of shares |  | € 101,782 | € 8,654 | € 32,526
Issue of ordinary shares |  | € 109,099 | € 8,903 | € 35,497
BVF Partners L.P., Novo A/S, New Enterprise Associates 17, L.P. and Sofinnova Partners |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares issued during the period | 3,778,338 |  |  |
Price per share | € 3.97 |  |  |
Par value per share | 0.01 |  |  |
Issue premium per share | € 3.96 |  |  |
Net proceeds from issuance of shares | € 14,700 |  |  |
Issue of ordinary shares | € 15,000 |  |  |

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